Teensy 2.0 and LC Not Writing to USB Serial

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r.schuster3

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I have done this with two Teensy 2.0's and a Teensy LC with the same results for each. My Arduino IDE is 1.8.12, Teensyduino is the latest Linux 64 bit (as of yesterday), and Teensy loader is 1.48. Running on Ubuntu 18.04.

Note, at least one of the Teensy 2.0's has been used in the last several weeks to power a "turn NeoPixel lights to different settings using buttons" prototype. This was successful.

First, I open up Arduino IDE, connect the Teensy 2.0 or LC via USB, and load the following example code to verify they work:

Code: 
const int ledPin = 11;

void setup() {
  // initialize the digital pin as an output.
  pinMode(ledPin, OUTPUT);
}

void loop() {
  digitalWrite(ledPin, HIGH);   // set the LED on
  delay(1000);                  // wait for a second
  digitalWrite(ledPin, LOW);    // set the LED off
  delay(1000);                  // wait for a second
}

Success!

Then I load the following code to test writing to Serial (serial monitor is open and set to 9600 baud; I have also tried this with 115200 baud):

Code: 
void setup() {
  Serial.begin(9600);
}

void loop() {
  Serial.println("Hello");
  delay(1000);
}

When I upload, I simply get "An error occurred while uploading the sketch". No other error messages printed above or below that (just the little white lines about how much memory I'm using). The Serial doesn't print. I tried this on all three microprocessors before and after updating Arduino IDE, Teensyduino, and Teensy loader. I also restarted my computer. Still fails. Any ideas what's going on here?
 
I have the same environment as you, except I use Ubuntu 18.10
To recap, your devices and device to PC communication worked for several weeks. Then you started encountering communications difficulties between device and PC.

Exactly the same thing happened to me. It was most frustrating. It turned out that the problem was caused by my USB cables and connectors. After going through my stock of USB cables and carefully remaking all connections the problem was solved. As long as I don't disturb my USB connections my Teensy life is problem free.

The problem lay with me. Over time I have accumulated lots of old USB cables and I made the mistake of dipping into my old stock. I think that the connectors are of poor quality and corrode over time.

I have a sneaking suspicion that the Arduino routines handling PC to Teensy communication are not as robust as they might be. But I can't back up my claim with hard evidence so for the time being I will grant them the presumption of innocence.

Now I use magnetic attachment USB cables. They are much easier to use, allowing one to make and break connections with ease and without disturbing the vulnerable USB connector on the device. I have retrofitted all my devices with these cables. This is a real blessing for devices, such as my smartphone, that need frequent charging.
This is where I bought my cables
https://www.aliexpress.com/item/1000006327495.html

Some of the cables I bought provide power only while others provide power and data.
 
Before pouring a lot of time into hardware troubleshooting, check for ModemManager interfering and make sure you have the latest udev rules proper installed.

https://www.pjrc.com/teensy/49-teensy.rules

Ubuntu recently updated the default config for ModemManager, causing it to again interfere with Teensy and Arduino and many other USB devices! ModemManager has a bug where it doesn't respect the normal ID_MM_DEVICE_IGNORE in the "strict" filter config Ubuntu recently started using as its default setting. The ModemManager developers are aware of this problem and have fixed their code upstream, but it will likely be years until those fixes become part of any Ubuntu LTS release. Until then, ModemManager is again causing pain & suffering for so many Linux uses.

ModemManager is difficult to delete. Normal apt remove doesn't delete it. You need at least apt purge. Even if you manage to get rid of ModemManager, it has an annoying habit of coming back from the dead as you update Ubuntu.

So get the latest udev rules. We updated that file recently, to add a second way to ask ModemManager not to interfere with Teensy (ID_MM_DEVICE_IGNORE was supposed to be the official way, but that no longer works on Ubuntu). If you installed the udev rules quite some time ago, you may have the older copy without "ID_MM_PORT_IGNORE". Make sure you have the latest udev rules, so you're protected when/if some Ubuntu update again imposes ModemManager upon your system.
 
Also, check to make sure there isn't an extra copy of "teensy_serialmon" left running. Quit Arduino, then run "ps aux | grep teensy_serialmon" in a terminal. If it shows a process by that name, use "killall teensy_serialmon" to make it exit.
 
Sorry for the late reply. I had to attend to other life things!

I ordered a new serial cable and tested it with the Teensy 2.0. No dice. I also updated with the latest `49-teensy.rules` at `/etc/udev/rules/`, ran `sudo apt-get purge modemmanager`, and did `killall teensy_serialmon`. I'm still getting the same error (on Teensy 2.0 and LC) when I upload the code (and no serial output): "An error occurred while uploading the sketch".

To double-check the Teensies and cables were working still, I successfully uploaded the "Blink" example again.

Not sure where to go now. Based on what you've both said I'm betting my recent upgrade to Ubuntu 18.04 (from 16.04) may be to blame.
 
r.schuster3 said:
I ordered a new serial cable and tested it with the Teensy 2.0. No dice.
Click to expand...

Do you mean USB cable? All the advice in this thread has been for a regular USB cable and wouldn't apply for a "serial cable", where you would need to connect to specific pins and use Serial1 rather than Serial in your code.

Maybe you mean a USB to serial cable? If so, Please be specific about the exact cable and how you're really using it. Photos are best, so we can see how you've actually connected the wires (mistakes like TX-to-TX instead of RX-to-TX are common). The exact code you're running matters too, especially using the correct name in the code for the pins where you've connected.

I'm pretty sure you don't mean this sort of serial cable, do you?

cable_serial.jpg
 
RSchuster,
To help diagnose the problem I suggest you provide the following information:
1) The output from the command lsusb
For example, from my machine
Code: 
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 018: ID 1546:01a8 U-Blox AG [u-blox 8]
Bus 001 Device 007: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
Bus 001 Device 066: ID 16c0:0483 Van Ooijen Technische Informatica Teensyduino Serial
Bus 001 Device 006: ID 2001:3c22 D-Link Corp. 
Bus 001 Device 005: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 001 Device 004: ID 058f:6362 Alcor Micro Corp. Flash Card Reader/Writer
Bus 001 Device 003: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 001 Device 002: ID 046d:c52f Logitech, Inc. Unifying Receiver
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
You should have a line that looks something like "Teensyduino Serial"

2) Give us the output from the Teensy loader, the small window that appears when you compile and upload. You can find the output under Help|Verbose info
Below is an example from my machine where I deliberately create the error by leaving another serial monitor open and connected to the Teensy
Code: 
08:20:30.430 (post_compile 1): Begin, version=1.51
08:20:30.481 (loader): Teensy Loader 1.51, begin program
08:20:30.506 (loader): File "AverageExample.ino.hex". 20796 bytes, 1% used
08:20:30.510 (loader): Listening for remote control on port 3149
08:20:30.510 (loader): initialized, showing main window
08:20:30.531 (loader): remote connection 4 opened
08:20:30.531 (post_compile 1): Sending command: comment: Teensyduino 1.51 - LINUX64 (teensy_post_compile)
08:20:30.531 (loader): remote cmd from 4: "comment: Teensyduino 1.51 - LINUX64 (teensy_post_compile)"
08:20:30.531 (loader): remote cmd from 4: "status"
08:20:30.597 (post_compile 1): Status: 1, 0, 0, 0, 0, 0, /tmp/arduino_build_801525/, AverageExample.ino.hex
08:20:30.597 (post_compile 1): Sending command: auto:on
08:20:30.598 (loader): remote cmd from 4: "auto:on"
08:20:30.598 (post_compile 1): Disconnect
08:20:30.609 (loader): remote connection 4 closed
08:20:30.729 (post_compile 2): Begin, version=1.51
08:20:30.729 (loader): remote connection 4 opened
08:20:30.734 (post_compile 2): Sending command: comment: Teensyduino 1.51 - LINUX64 (teensy_post_compile)
08:20:30.734 (loader): remote cmd from 4: "comment: Teensyduino 1.51 - LINUX64 (teensy_post_compile)"
08:20:30.734 (loader): remote cmd from 4: "status"
08:20:30.811 (post_compile 2): Status: 1, 1, 0, 0, 0, 0, /tmp/arduino_build_801525/, AverageExample.ino.hex
08:20:30.811 (post_compile 2): Disconnect
08:20:30.821 (post_compile 3): Running teensy_reboot: /home/peter/Downloads/arduino-1.8.12/hardware/teensy/../tools/teensy_reboot
08:20:30.873 (loader): remote connection 5 opened
08:20:30.873 (loader): remote connection 4 closed
08:20:30.873 (loader): remote connection 5 closed
08:20:30.874 (reboot 4): Begin, version=1.51
08:20:30.874 (reboot 4): location = /sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:30.874 (reboot 4): portlabel = /dev/ttyACM0 Serial
08:20:30.874 (reboot 4): Only location /sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2 will be tried
08:20:30.874 (reboot 4): portprotocol = Teensy
08:20:30.883 (loader): remote connection 4 opened
08:20:30.885 (reboot 4): add device: subsys=usb, type=usb_device, location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:30.885 (reboot 4):   devnode=/dev/bus/usb/001/064, subsystem=usb, ifacenum=-1
08:20:30.885 (reboot 4): add child:  subsys=usb, type=usb_interface, location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0
08:20:30.885 (reboot 4):   parent location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:30.885 (reboot 4):   model=36 (Teensy 4.0)
08:20:30.885 (reboot 4): add child:  subsys=tty, type=(null), location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0/tty/ttyACM0
08:20:30.885 (reboot 4):   parent location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:30.885 (reboot 4):   devnode=/dev/ttyACM0, subsystem=tty, ifacenum=0
08:20:30.885 (reboot 4): add child:  subsys=usb, type=usb_interface, location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.1
08:20:30.885 (reboot 4):   parent location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:30.927 (loader): remote cmd from 4: "show:arduino_attempt_reboot"
08:20:30.927 (loader): got request to show arduino rebooting message
08:20:30.934 (loader): remote cmd from 4: "comment: Teensyduino 1.51 - LINUX64 (teensy_reboot)"
08:20:30.934 (loader): remote cmd from 4: "status"
08:20:31.020 (loader): remote cmd from 4: "status"
08:20:31.179 (loader): remote cmd from 4: "status"
08:20:31.235 (ports 5): unknown action: unbind
08:20:31.235 (ports 5): del child: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0/tty/ttyACM0
08:20:31.235 (ports 5):   devnode=/dev/bus/usb/001/064, subsystem=usb, ifacenum=-1
08:20:31.239 (ports 5): unknown action: unbind
08:20:31.239 (ports 5): del child: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.1
08:20:31.265 (loader): remote connection 4 opened
08:20:31.265 (ports 5): del child: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0
08:20:31.265 (loader): remote connection 4 closed
08:20:31.763 (ports 5): unknown action: unbind
08:20:31.772 (ports 5): del device: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:31.805 (ports 5): add device: subsys=usb, type=usb_device, location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:31.805 (ports 5):   devnode=/dev/bus/usb/001/065, subsystem=usb, ifacenum=-1
08:20:31.805 (ports 5): usb_add: /dev/bus/usb/001/065 (Teensy 4.0) Bootloader
08:20:31.824 (ports 5): add child:  subsys=usb, type=usb_interface, location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0
08:20:31.824 (ports 5):   parent location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:31.824 (ports 5): usb_add: /dev/bus/usb/001/065 (Teensy 4.0) Bootloader
08:20:31.825 (ports 5): add child:  subsys=hid, type=(null), location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0/0003:16C0:0478.001E
08:20:31.825 (ports 5):   parent location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:31.825 (ports 5):   model=36 (Teensy 4.0)
08:20:31.825 (ports 5): usb_add: /dev/bus/usb/001/065 (Teensy 4.0) Bootloader
08:20:31.829 (ports 5): add child:  subsys=hidraw, type=(null), location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0/0003:16C0:0478.001E/hidraw/hidraw3
08:20:31.829 (ports 5):   parent location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:31.829 (ports 5): usb_add: /dev/bus/usb/001/065 (Teensy 4.0) Bootloader
08:20:31.830 (ports 5): unknown action: bind
08:20:31.832 (ports 5): unknown action: bind
08:20:31.839 (ports 5): unknown action: bind
08:20:31.894 (loader): Device came online, code_size = 2031616
08:20:31.894 (loader): Board is: Teensy 4.0 (IMXRT1062), version 1.05
08:20:31.895 (ports 5): del child: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0/0003:16C0:0478.001E/hidraw/hidraw3
08:20:31.896 (ports 5): unknown action: unbind
08:20:31.897 (ports 5): del child: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0/0003:16C0:0478.001E
08:20:31.898 (ports 5): unknown action: unbind
08:20:31.904 (loader): File "AverageExample.ino.hex". 20796 bytes, 1% used
08:20:31.909 (loader): set background IMG_ONLINE
08:20:31.921 (loader): File "AverageExample.ino.hex". 20796 bytes, 1% used
08:20:31.925 (loader): elf appears to be for Teensy 4.0 (IMXRT1062) (2031616 bytes)
08:20:31.925 (loader): elf binary data matches hex file
08:20:31.925 (loader): elf file is for Teensy 4.0 (IMXRT1062)
08:20:31.929 (loader): begin operation
08:20:31.935 (loader): flash, block=0, bs=1024, auto=1
08:20:31.935 (loader):  gauge old value = 0
08:20:31.935 (loader): flash, block=1, bs=1024, auto=1
08:20:32.109 (loader):  gauge old value = 1
08:20:32.111 (loader): flash, block=2, bs=1024, auto=1
08:20:32.111 (loader):  gauge old value = 2
08:20:32.112 (loader): flash, block=3, bs=1024, auto=1
08:20:32.112 (loader):  gauge old value = 3
08:20:32.113 (loader): flash, block=4, bs=1024, auto=1
08:20:32.113 (loader):  gauge old value = 4
08:20:32.119 (loader): flash, block=5, bs=1024, auto=1
08:20:32.119 (loader):  gauge old value = 5
08:20:32.122 (loader): flash, block=6, bs=1024, auto=1
08:20:32.122 (loader):  gauge old value = 6
08:20:32.125 (loader): flash, block=7, bs=1024, auto=1
08:20:32.126 (loader):  gauge old value = 7
08:20:32.128 (loader): flash, block=8, bs=1024, auto=1
08:20:32.129 (loader):  gauge old value = 8
08:20:32.131 (loader): flash, block=9, bs=1024, auto=1
08:20:32.131 (loader):  gauge old value = 9
08:20:32.134 (loader): flash, block=10, bs=1024, auto=1
08:20:32.134 (loader):  gauge old value = 10
08:20:32.138 (loader): flash, block=11, bs=1024, auto=1
08:20:32.138 (loader):  gauge old value = 11
08:20:32.142 (loader): flash, block=12, bs=1024, auto=1
08:20:32.142 (loader):  gauge old value = 12
08:20:32.145 (loader): flash, block=13, bs=1024, auto=1
08:20:32.145 (loader):  gauge old value = 13
08:20:32.147 (loader): flash, block=14, bs=1024, auto=1
08:20:32.147 (loader):  gauge old value = 14
08:20:32.149 (loader): flash, block=15, bs=1024, auto=1
08:20:32.149 (loader):  gauge old value = 15
08:20:32.151 (loader): flash, block=16, bs=1024, auto=1
08:20:32.151 (loader):  gauge old value = 16
08:20:32.152 (loader): flash, block=17, bs=1024, auto=1
08:20:32.152 (loader):  gauge old value = 17
08:20:32.154 (loader): flash, block=18, bs=1024, auto=1
08:20:32.154 (loader):  gauge old value = 18
08:20:32.155 (loader): flash, block=19, bs=1024, auto=1
08:20:32.156 (loader):  gauge old value = 19
08:20:32.158 (loader): flash, block=20, bs=1024, auto=1
08:20:32.158 (loader):  gauge old value = 20
08:20:32.160 (loader): sending reboot
08:20:32.164 (loader): begin wait_until_offline
08:20:32.260 (ports 5): unknown action: unbind
08:20:32.265 (loader): HID/linux: something changed, try reading a descriptor
08:20:32.265 (loader): HID/linux: Device was just disconnected
08:20:32.265 (loader): offline, waited 2
08:20:32.265 (loader): end operation, total time = 0.336 seconds
08:20:32.265 (loader): set background IMG_REBOOT_OK
08:20:32.273 (loader): redraw timer set, image 14 to show for 1200 ms
08:20:32.274 (ports 5): del child: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0
08:20:32.834 (ports 5): unknown action: unbind
08:20:32.839 (ports 5): del device: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:32.850 (ports 5): add device: subsys=usb, type=usb_device, location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:32.850 (ports 5):   devnode=/dev/bus/usb/001/066, subsystem=usb, ifacenum=-1
08:20:32.850 (ports 5): usb_add: /dev/bus/usb/001/066 (Teensy 4.0) Serial
08:20:33.474 (loader): redraw, image 9
08:20:40.770 (loader): Verbose Info event

3) Give us an excerpt from the compile/link result menu at the bottom of the Arduino IDE. For example
Code: 
Opening Teensy Loader...
/home/peter/Downloads/arduino-1.8.12/hardware/teensy/../tools/arm/bin/arm-none-eabi-size -A /tmp/arduino_build_801525/AverageExample.ino.elf
Sketch uses 20784 bytes (1%) of program storage space. Maximum is 2031616 bytes.
Global variables use 45748 bytes (8%) of dynamic memory, leaving 478540 bytes for local variables. Maximum is 524288 bytes.
/home/peter/Downloads/arduino-1.8.12/hardware/teensy/../tools/teensy_post_compile -file=AverageExample.ino -path=/tmp/arduino_build_801525 -tools=/home/peter/Downloads/arduino-1.8.12/hardware/teensy/../tools -board=TEENSY40 -reboot -port=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2 -portlabel=/dev/ttyACM0 Serial -portprotocol=Teensy 
An error occurred while uploading the sketch

This information may help us to understand the problem.
 
PaulStoffregen said:
Do you mean USB cable? All the advice in this thread has been for a regular USB cable and wouldn't apply for a "serial cable", where you would need to connect to specific pins and use Serial1 rather than Serial in your code.

Maybe you mean a USB to serial cable? If so, Please be specific about the exact cable and how you're really using it. Photos are best, so we can see how you've actually connected the wires (mistakes like TX-to-TX instead of RX-to-TX are common). The exact code you're running matters too, especially using the correct name in the code for the pins where you've connected.

I'm pretty sure you don't mean this sort of serial cable, do you?

cable_serial.jpg
Click to expand...

My bad! This was entirely a typo! I meant to say "USB" cable, but was staring at the code sample I'd posted that said `Serial`. I have been using USB cables (and the built in USB ports) with the Teensies this whole time.
 
PDOS said:
RSchuster,
To help diagnose the problem I suggest you provide the following information:
1) The output from the command lsusb
For example, from my machine
Code: 
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 018: ID 1546:01a8 U-Blox AG [u-blox 8]
Bus 001 Device 007: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC
Bus 001 Device 066: ID 16c0:0483 Van Ooijen Technische Informatica Teensyduino Serial
Bus 001 Device 006: ID 2001:3c22 D-Link Corp. 
Bus 001 Device 005: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 001 Device 004: ID 058f:6362 Alcor Micro Corp. Flash Card Reader/Writer
Bus 001 Device 003: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 001 Device 002: ID 046d:c52f Logitech, Inc. Unifying Receiver
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
You should have a line that looks something like "Teensyduino Serial"

2) Give us the output from the Teensy loader, the small window that appears when you compile and upload. You can find the output under Help|Verbose info
Below is an example from my machine where I deliberately create the error by leaving another serial monitor open and connected to the Teensy
Code: 
08:20:30.430 (post_compile 1): Begin, version=1.51
08:20:30.481 (loader): Teensy Loader 1.51, begin program
08:20:30.506 (loader): File "AverageExample.ino.hex". 20796 bytes, 1% used
08:20:30.510 (loader): Listening for remote control on port 3149
08:20:30.510 (loader): initialized, showing main window
08:20:30.531 (loader): remote connection 4 opened
08:20:30.531 (post_compile 1): Sending command: comment: Teensyduino 1.51 - LINUX64 (teensy_post_compile)
08:20:30.531 (loader): remote cmd from 4: "comment: Teensyduino 1.51 - LINUX64 (teensy_post_compile)"
08:20:30.531 (loader): remote cmd from 4: "status"
08:20:30.597 (post_compile 1): Status: 1, 0, 0, 0, 0, 0, /tmp/arduino_build_801525/, AverageExample.ino.hex
08:20:30.597 (post_compile 1): Sending command: auto:on
08:20:30.598 (loader): remote cmd from 4: "auto:on"
08:20:30.598 (post_compile 1): Disconnect
08:20:30.609 (loader): remote connection 4 closed
08:20:30.729 (post_compile 2): Begin, version=1.51
08:20:30.729 (loader): remote connection 4 opened
08:20:30.734 (post_compile 2): Sending command: comment: Teensyduino 1.51 - LINUX64 (teensy_post_compile)
08:20:30.734 (loader): remote cmd from 4: "comment: Teensyduino 1.51 - LINUX64 (teensy_post_compile)"
08:20:30.734 (loader): remote cmd from 4: "status"
08:20:30.811 (post_compile 2): Status: 1, 1, 0, 0, 0, 0, /tmp/arduino_build_801525/, AverageExample.ino.hex
08:20:30.811 (post_compile 2): Disconnect
08:20:30.821 (post_compile 3): Running teensy_reboot: /home/peter/Downloads/arduino-1.8.12/hardware/teensy/../tools/teensy_reboot
08:20:30.873 (loader): remote connection 5 opened
08:20:30.873 (loader): remote connection 4 closed
08:20:30.873 (loader): remote connection 5 closed
08:20:30.874 (reboot 4): Begin, version=1.51
08:20:30.874 (reboot 4): location = /sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:30.874 (reboot 4): portlabel = /dev/ttyACM0 Serial
08:20:30.874 (reboot 4): Only location /sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2 will be tried
08:20:30.874 (reboot 4): portprotocol = Teensy
08:20:30.883 (loader): remote connection 4 opened
08:20:30.885 (reboot 4): add device: subsys=usb, type=usb_device, location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:30.885 (reboot 4):   devnode=/dev/bus/usb/001/064, subsystem=usb, ifacenum=-1
08:20:30.885 (reboot 4): add child:  subsys=usb, type=usb_interface, location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0
08:20:30.885 (reboot 4):   parent location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:30.885 (reboot 4):   model=36 (Teensy 4.0)
08:20:30.885 (reboot 4): add child:  subsys=tty, type=(null), location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0/tty/ttyACM0
08:20:30.885 (reboot 4):   parent location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:30.885 (reboot 4):   devnode=/dev/ttyACM0, subsystem=tty, ifacenum=0
08:20:30.885 (reboot 4): add child:  subsys=usb, type=usb_interface, location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.1
08:20:30.885 (reboot 4):   parent location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:30.927 (loader): remote cmd from 4: "show:arduino_attempt_reboot"
08:20:30.927 (loader): got request to show arduino rebooting message
08:20:30.934 (loader): remote cmd from 4: "comment: Teensyduino 1.51 - LINUX64 (teensy_reboot)"
08:20:30.934 (loader): remote cmd from 4: "status"
08:20:31.020 (loader): remote cmd from 4: "status"
08:20:31.179 (loader): remote cmd from 4: "status"
08:20:31.235 (ports 5): unknown action: unbind
08:20:31.235 (ports 5): del child: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0/tty/ttyACM0
08:20:31.235 (ports 5):   devnode=/dev/bus/usb/001/064, subsystem=usb, ifacenum=-1
08:20:31.239 (ports 5): unknown action: unbind
08:20:31.239 (ports 5): del child: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.1
08:20:31.265 (loader): remote connection 4 opened
08:20:31.265 (ports 5): del child: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0
08:20:31.265 (loader): remote connection 4 closed
08:20:31.763 (ports 5): unknown action: unbind
08:20:31.772 (ports 5): del device: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:31.805 (ports 5): add device: subsys=usb, type=usb_device, location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:31.805 (ports 5):   devnode=/dev/bus/usb/001/065, subsystem=usb, ifacenum=-1
08:20:31.805 (ports 5): usb_add: /dev/bus/usb/001/065 (Teensy 4.0) Bootloader
08:20:31.824 (ports 5): add child:  subsys=usb, type=usb_interface, location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0
08:20:31.824 (ports 5):   parent location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:31.824 (ports 5): usb_add: /dev/bus/usb/001/065 (Teensy 4.0) Bootloader
08:20:31.825 (ports 5): add child:  subsys=hid, type=(null), location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0/0003:16C0:0478.001E
08:20:31.825 (ports 5):   parent location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:31.825 (ports 5):   model=36 (Teensy 4.0)
08:20:31.825 (ports 5): usb_add: /dev/bus/usb/001/065 (Teensy 4.0) Bootloader
08:20:31.829 (ports 5): add child:  subsys=hidraw, type=(null), location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0/0003:16C0:0478.001E/hidraw/hidraw3
08:20:31.829 (ports 5):   parent location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:31.829 (ports 5): usb_add: /dev/bus/usb/001/065 (Teensy 4.0) Bootloader
08:20:31.830 (ports 5): unknown action: bind
08:20:31.832 (ports 5): unknown action: bind
08:20:31.839 (ports 5): unknown action: bind
08:20:31.894 (loader): Device came online, code_size = 2031616
08:20:31.894 (loader): Board is: Teensy 4.0 (IMXRT1062), version 1.05
08:20:31.895 (ports 5): del child: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0/0003:16C0:0478.001E/hidraw/hidraw3
08:20:31.896 (ports 5): unknown action: unbind
08:20:31.897 (ports 5): del child: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0/0003:16C0:0478.001E
08:20:31.898 (ports 5): unknown action: unbind
08:20:31.904 (loader): File "AverageExample.ino.hex". 20796 bytes, 1% used
08:20:31.909 (loader): set background IMG_ONLINE
08:20:31.921 (loader): File "AverageExample.ino.hex". 20796 bytes, 1% used
08:20:31.925 (loader): elf appears to be for Teensy 4.0 (IMXRT1062) (2031616 bytes)
08:20:31.925 (loader): elf binary data matches hex file
08:20:31.925 (loader): elf file is for Teensy 4.0 (IMXRT1062)
08:20:31.929 (loader): begin operation
08:20:31.935 (loader): flash, block=0, bs=1024, auto=1
08:20:31.935 (loader):  gauge old value = 0
08:20:31.935 (loader): flash, block=1, bs=1024, auto=1
08:20:32.109 (loader):  gauge old value = 1
08:20:32.111 (loader): flash, block=2, bs=1024, auto=1
08:20:32.111 (loader):  gauge old value = 2
08:20:32.112 (loader): flash, block=3, bs=1024, auto=1
08:20:32.112 (loader):  gauge old value = 3
08:20:32.113 (loader): flash, block=4, bs=1024, auto=1
08:20:32.113 (loader):  gauge old value = 4
08:20:32.119 (loader): flash, block=5, bs=1024, auto=1
08:20:32.119 (loader):  gauge old value = 5
08:20:32.122 (loader): flash, block=6, bs=1024, auto=1
08:20:32.122 (loader):  gauge old value = 6
08:20:32.125 (loader): flash, block=7, bs=1024, auto=1
08:20:32.126 (loader):  gauge old value = 7
08:20:32.128 (loader): flash, block=8, bs=1024, auto=1
08:20:32.129 (loader):  gauge old value = 8
08:20:32.131 (loader): flash, block=9, bs=1024, auto=1
08:20:32.131 (loader):  gauge old value = 9
08:20:32.134 (loader): flash, block=10, bs=1024, auto=1
08:20:32.134 (loader):  gauge old value = 10
08:20:32.138 (loader): flash, block=11, bs=1024, auto=1
08:20:32.138 (loader):  gauge old value = 11
08:20:32.142 (loader): flash, block=12, bs=1024, auto=1
08:20:32.142 (loader):  gauge old value = 12
08:20:32.145 (loader): flash, block=13, bs=1024, auto=1
08:20:32.145 (loader):  gauge old value = 13
08:20:32.147 (loader): flash, block=14, bs=1024, auto=1
08:20:32.147 (loader):  gauge old value = 14
08:20:32.149 (loader): flash, block=15, bs=1024, auto=1
08:20:32.149 (loader):  gauge old value = 15
08:20:32.151 (loader): flash, block=16, bs=1024, auto=1
08:20:32.151 (loader):  gauge old value = 16
08:20:32.152 (loader): flash, block=17, bs=1024, auto=1
08:20:32.152 (loader):  gauge old value = 17
08:20:32.154 (loader): flash, block=18, bs=1024, auto=1
08:20:32.154 (loader):  gauge old value = 18
08:20:32.155 (loader): flash, block=19, bs=1024, auto=1
08:20:32.156 (loader):  gauge old value = 19
08:20:32.158 (loader): flash, block=20, bs=1024, auto=1
08:20:32.158 (loader):  gauge old value = 20
08:20:32.160 (loader): sending reboot
08:20:32.164 (loader): begin wait_until_offline
08:20:32.260 (ports 5): unknown action: unbind
08:20:32.265 (loader): HID/linux: something changed, try reading a descriptor
08:20:32.265 (loader): HID/linux: Device was just disconnected
08:20:32.265 (loader): offline, waited 2
08:20:32.265 (loader): end operation, total time = 0.336 seconds
08:20:32.265 (loader): set background IMG_REBOOT_OK
08:20:32.273 (loader): redraw timer set, image 14 to show for 1200 ms
08:20:32.274 (ports 5): del child: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2/1-7.4.2:1.0
08:20:32.834 (ports 5): unknown action: unbind
08:20:32.839 (ports 5): del device: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:32.850 (ports 5): add device: subsys=usb, type=usb_device, location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2
08:20:32.850 (ports 5):   devnode=/dev/bus/usb/001/066, subsystem=usb, ifacenum=-1
08:20:32.850 (ports 5): usb_add: /dev/bus/usb/001/066 (Teensy 4.0) Serial
08:20:33.474 (loader): redraw, image 9
08:20:40.770 (loader): Verbose Info event

3) Give us an excerpt from the compile/link result menu at the bottom of the Arduino IDE. For example
Code: 
Opening Teensy Loader...
/home/peter/Downloads/arduino-1.8.12/hardware/teensy/../tools/arm/bin/arm-none-eabi-size -A /tmp/arduino_build_801525/AverageExample.ino.elf
Sketch uses 20784 bytes (1%) of program storage space. Maximum is 2031616 bytes.
Global variables use 45748 bytes (8%) of dynamic memory, leaving 478540 bytes for local variables. Maximum is 524288 bytes.
/home/peter/Downloads/arduino-1.8.12/hardware/teensy/../tools/teensy_post_compile -file=AverageExample.ino -path=/tmp/arduino_build_801525 -tools=/home/peter/Downloads/arduino-1.8.12/hardware/teensy/../tools -board=TEENSY40 -reboot -port=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7.4/1-7.4.2 -portlabel=/dev/ttyACM0 Serial -portprotocol=Teensy 
An error occurred while uploading the sketch

This information may help us to understand the problem.
Click to expand...

Output of `lsusb`:
Code: 
ryan@ryan-ThinkPad-T460s:~$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 04f2:b52c Chicony Electronics Co., Ltd 
Bus 001 Device 011: ID 16c0:0483 Van Ooijen Technische Informatica Teensyduino Serial
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Output of Teensy Loader:
Code: 
09:26:26.802 (post_compile 1): Begin, version=1.51
09:26:26.883 (loader): Teensy Loader 1.51, begin program
09:26:26.892 (loader): Listening for remote control on port 3149
09:26:26.892 (loader): initialized, showing main window
09:26:26.904 (loader): remote connection 10 opened
09:26:26.904 (post_compile 1): Sending command: comment: Teensyduino 1.51 - LINUX64 (teensy_post_compile)
09:26:26.904 (loader): remote cmd from 10: "comment: Teensyduino 1.51 - LINUX64 (teensy_post_compile)"
09:26:26.905 (loader): remote cmd from 10: "status"
09:26:26.998 (post_compile 1): Status: 0, 0, 0, 0, 0, 0, /tmp/arduino_build_205249/, test_serial.ino.hex
09:26:26.998 (post_compile 1): Sending command: dir:/tmp/arduino_build_274178/
09:26:26.998 (loader): remote cmd from 10: "dir:/tmp/arduino_build_274178/"
09:26:26.998 (post_compile 1): Sending command: file:test_serial.ino.hex
09:26:26.998 (loader): remote cmd from 10: "file:test_serial.ino.hex"
09:26:27.023 (loader): File "test_serial.ino.hex". 3200 bytes, 10% used
09:26:27.031 (loader): remote cmd from 10: "status"
09:26:27.125 (post_compile 1): Status: 1, 0, 0, 0, 0, 0, /tmp/arduino_build_274178/, test_serial.ino.hex
09:26:27.125 (post_compile 1): Sending command: auto:on
09:26:27.126 (loader): remote cmd from 10: "auto:on"
09:26:27.126 (post_compile 1): Disconnect
09:26:27.136 (loader): remote connection 10 closed
09:26:31.112 (post_compile 2): Begin, version=1.51
09:26:31.112 (loader): remote connection 10 opened
09:26:31.112 (post_compile 2): Sending command: comment: Teensyduino 1.51 - LINUX64 (teensy_post_compile)
09:26:31.112 (loader): remote cmd from 10: "comment: Teensyduino 1.51 - LINUX64 (teensy_post_compile)"
09:26:31.112 (loader): remote cmd from 10: "status"
09:26:31.112 (loader): file changed
09:26:31.122 (loader): File "test_serial.ino.hex". 3200 bytes, 10% used
09:26:31.217 (post_compile 2): Status: 1, 1, 0, 0, 0, 0, /tmp/arduino_build_274178/, test_serial.ino.hex
09:26:31.217 (post_compile 2): Disconnect
09:26:31.228 (loader): remote connection 10 closed
09:26:31.255 (post_compile 3): Begin, version=1.51
09:26:31.255 (loader): remote connection 10 opened
09:26:31.255 (post_compile 3): Sending command: comment: Teensyduino 1.51 - LINUX64 (teensy_post_compile)
09:26:31.255 (loader): remote cmd from 10: "comment: Teensyduino 1.51 - LINUX64 (teensy_post_compile)"
09:26:31.255 (loader): remote cmd from 10: "status"
09:26:31.350 (post_compile 3): Status: 1, 1, 0, 0, 0, 0, /tmp/arduino_build_274178/, test_serial.ino.hex
09:26:31.350 (post_compile 3): Disconnect
09:26:31.360 (post_compile 4): Running teensy_reboot: /home/ryan/ryan_stuff/projects/microprocessing/arduino-1.8.12/hardware/teensy/../tools/teensy_reboot
09:26:31.361 (loader): remote connection 10 closed
09:26:31.361 (loader): remote connection 10 opened
09:26:31.361 (loader): remote connection 10 closed
09:26:31.365 (reboot 5): Begin, version=1.51
09:26:31.365 (reboot 5): location = /dev/ttyS4
09:26:31.365 (reboot 5): portlabel = /dev/ttyS4
09:26:31.365 (reboot 5): portprotocol = serial
09:26:31.365 (reboot 5): Serial device /dev/ttyS4 will be tried first
09:26:31.392 (loader): remote connection 10 opened
09:26:31.393 (reboot 5): add device: subsys=usb, type=usb_device, location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3
09:26:31.393 (reboot 5):   devnode=/dev/bus/usb/001/011, subsystem=usb, ifacenum=-1
09:26:31.393 (reboot 5): add child:  subsys=usb, type=usb_interface, location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0
09:26:31.393 (reboot 5):   parent location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3
09:26:31.393 (reboot 5):   model=27 (Teensy 2.0)
09:26:31.394 (reboot 5): add child:  subsys=tty, type=(null), location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/tty/ttyACM0
09:26:31.394 (reboot 5):   parent location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3
09:26:31.394 (reboot 5):   devnode=/dev/ttyACM0, subsystem=tty, ifacenum=0
09:26:31.395 (reboot 5): add child:  subsys=usb, type=usb_interface, location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.1
09:26:31.395 (reboot 5):   parent location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3
09:26:31.473 (loader): remote cmd from 10: "show:arduino_attempt_reboot"
09:26:31.473 (loader): got request to show arduino rebooting message
09:26:31.481 (loader): remote cmd from 10: "comment: Teensyduino 1.51 - LINUX64 (teensy_reboot)"
09:26:31.482 (loader): remote cmd from 10: "status"
09:26:31.596 (loader): remote cmd from 10: "status"
09:26:31.600 (ports 6): del child: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/tty/ttyACM0
09:26:31.600 (ports 6):   devnode=/dev/bus/usb/001/011, subsystem=usb, ifacenum=-1
09:26:31.664 (loader): remote connection 10 opened
09:26:31.664 (loader): remote connection 10 closed
09:26:31.666 (ports 6): unknown action: unbind
09:26:31.666 (ports 6): unknown action: unbind
09:26:31.666 (ports 6): del child: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0
09:26:31.666 (ports 6): del child: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.1
09:26:31.666 (ports 6): unknown action: unbind
09:26:31.666 (ports 6): del device: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3
09:26:32.063 (ports 6): add device: subsys=usb, type=usb_device, location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3
09:26:32.063 (ports 6):   devnode=/dev/bus/usb/001/012, subsystem=usb, ifacenum=-1
09:26:32.063 (ports 6): usb_add: /dev/bus/usb/001/012 (Teensy 2.0) Bootloader
09:26:32.065 (ports 6): add child:  subsys=usb, type=usb_interface, location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0
09:26:32.065 (ports 6):   parent location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3
09:26:32.065 (ports 6): usb_add: /dev/bus/usb/001/012 (Teensy 2.0) Bootloader
09:26:32.069 (ports 6): add child:  subsys=hid, type=(null), location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/0003:16C0:0478.0004
09:26:32.069 (ports 6):   parent location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3
09:26:32.069 (ports 6):   model=27 (Teensy 2.0)
09:26:32.069 (ports 6): usb_add: /dev/bus/usb/001/012 (Teensy 2.0) Bootloader
09:26:32.069 (ports 6): add child:  subsys=hidraw, type=(null), location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/0003:16C0:0478.0004/hidraw/hidraw0
09:26:32.069 (ports 6):   parent location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3
09:26:32.069 (ports 6): usb_add: /dev/bus/usb/001/012 (Teensy 2.0) Bootloader
09:26:32.070 (ports 6): unknown action: bind
09:26:32.071 (ports 6): unknown action: bind
09:26:32.072 (ports 6): unknown action: bind
09:26:32.251 (loader): Device came online, code_size = 32256
09:26:32.251 (loader): Board is: Teensy 2.0 (ATMEGA32U4)
09:26:32.252 (ports 6): del child: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/0003:16C0:0478.0004/hidraw/hidraw0
09:26:32.253 (ports 6): unknown action: unbind
09:26:32.254 (ports 6): del child: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/0003:16C0:0478.0004
09:26:32.254 (ports 6): unknown action: unbind
09:26:32.260 (loader): File "test_serial.ino.hex". 3200 bytes, 10% used
09:26:32.266 (loader): set background IMG_ONLINE
09:26:32.278 (loader): File "test_serial.ino.hex". 3200 bytes, 10% used
09:26:32.285 (loader): elf appears to be for Teensy 2.0 (ATMEGA32U4) (32256 bytes)
09:26:32.285 (loader): elf binary data matches hex file
09:26:32.285 (loader): elf file is for Teensy 2.0 (ATMEGA32U4)
09:26:32.291 (loader): begin operation
09:26:32.294 (loader): flash, block=0, bs=128, auto=1
09:26:32.450 (loader):  gauge old value = 0
09:26:32.453 (loader): flash, block=1, bs=128, auto=1
09:26:32.458 (loader):  gauge old value = 1
09:26:32.459 (loader): flash, block=2, bs=128, auto=1
09:26:32.464 (loader):  gauge old value = 2
09:26:32.465 (loader): flash, block=3, bs=128, auto=1
09:26:32.470 (loader):  gauge old value = 3
09:26:32.471 (loader): flash, block=4, bs=128, auto=1
09:26:32.476 (loader):  gauge old value = 4
09:26:32.479 (loader): flash, block=5, bs=128, auto=1
09:26:32.484 (loader):  gauge old value = 5
09:26:32.486 (loader): flash, block=6, bs=128, auto=1
09:26:32.491 (loader):  gauge old value = 6
09:26:32.493 (loader): flash, block=7, bs=128, auto=1
09:26:32.498 (loader):  gauge old value = 7
09:26:32.499 (loader): flash, block=8, bs=128, auto=1
09:26:32.504 (loader):  gauge old value = 8
09:26:32.505 (loader): flash, block=9, bs=128, auto=1
09:26:32.510 (loader):  gauge old value = 9
09:26:32.511 (loader): flash, block=10, bs=128, auto=1
09:26:32.516 (loader):  gauge old value = 10
09:26:32.517 (loader): flash, block=11, bs=128, auto=1
09:26:32.522 (loader):  gauge old value = 11
09:26:32.524 (loader): flash, block=12, bs=128, auto=1
09:26:32.529 (loader):  gauge old value = 12
09:26:32.530 (loader): flash, block=13, bs=128, auto=1
09:26:32.534 (loader):  gauge old value = 13
09:26:32.536 (loader): flash, block=14, bs=128, auto=1
09:26:32.540 (loader):  gauge old value = 14
09:26:32.541 (loader): flash, block=15, bs=128, auto=1
09:26:32.546 (loader):  gauge old value = 15
09:26:32.547 (loader): flash, block=16, bs=128, auto=1
09:26:32.552 (loader):  gauge old value = 16
09:26:32.553 (loader): flash, block=17, bs=128, auto=1
09:26:32.559 (loader):  gauge old value = 17
09:26:32.560 (loader): flash, block=18, bs=128, auto=1
09:26:32.565 (loader):  gauge old value = 18
09:26:32.566 (loader): flash, block=19, bs=128, auto=1
09:26:32.571 (loader):  gauge old value = 19
09:26:32.572 (loader): flash, block=20, bs=128, auto=1
09:26:32.577 (loader):  gauge old value = 20
09:26:32.578 (loader): flash, block=21, bs=128, auto=1
09:26:32.583 (loader):  gauge old value = 21
09:26:32.584 (loader): flash, block=22, bs=128, auto=1
09:26:32.589 (loader):  gauge old value = 22
09:26:32.590 (loader): flash, block=23, bs=128, auto=1
09:26:32.595 (loader):  gauge old value = 23
09:26:32.596 (loader): flash, block=24, bs=128, auto=1
09:26:32.601 (loader):  gauge old value = 24
09:26:32.603 (loader): sending reboot
09:26:32.603 (loader): begin wait_until_offline
09:26:32.606 (ports 6): unknown action: unbind
09:26:32.607 (ports 6): del child: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0
09:26:32.610 (ports 6): unknown action: unbind
09:26:32.619 (ports 6): del device: location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3
09:26:32.653 (loader): HID/linux: something changed, try reading a descriptor
09:26:32.653 (loader): HID/linux: Device was just disconnected
09:26:32.653 (loader): offline, waited 1
09:26:32.653 (loader): end operation, total time = 0.363 seconds
09:26:32.654 (loader): set background IMG_REBOOT_OK
09:26:32.662 (loader): redraw timer set, image 14 to show for 1200 ms
09:26:33.082 (ports 6): add device: subsys=usb, type=usb_device, location=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3
09:26:33.082 (ports 6):   devnode=/dev/bus/usb/001/013, subsystem=usb, ifacenum=-1
09:26:33.082 (ports 6): usb_add: /dev/bus/usb/001/013 (Teensy 2.0) Serial
09:26:33.864 (loader): redraw, image 9
09:26:35.387 (loader): Verbose Info event

Output in Arduino IDE:
Code: 
Sketch uses 3200 bytes (9%) of program storage space. Maximum is 32256 bytes.
Global variables use 73 bytes (2%) of dynamic memory, leaving 2487 bytes for local variables. Maximum is 2560 bytes.
/home/ryan/ryan_stuff/projects/microprocessing/arduino-1.8.12/hardware/teensy/../tools/teensy_post_compile -file=test_serial.ino -path=/tmp/arduino_build_274178 -tools=/home/ryan/ryan_stuff/projects/microprocessing/arduino-1.8.12/hardware/teensy/../tools -board=TEENSY2 -reboot -port=/dev/ttyS4 -portlabel=/dev/ttyS4 -portprotocol=serial 
An error occurred while uploading the sketch

This is all with the Teensy 2.0 and new USB cable.

Also, what exactly is meant by "leaving another serial monitor on and connecting it to the Teensy"? I have closed all serial monitor windows and `ps aux | grep teensy_serialmon` shows nothing. But is there possibly another way a serial monitor could be on?
 
Last edited:
This line from lsusb means Teensy is connected.

Code: 
Bus 001 Device 011: ID 16c0:0483

That means your Teensy and your USB cable are working properly! 16c0:0483 is the proper ID for Teensy running in USB serial mode.

Something is probably wrong with your machine's setup.

What do you see from this command?

Code: 
cat /etc/udev/rules.d/49-teensy.rules
 
PaulStoffregen said:
This line from lsusb means Teensy is connected.

Code: 
Bus 001 Device 011: ID 16c0:0483

That means your Teensy and your USB cable are working properly! 16c0:0483 is the proper ID for Teensy running in USB serial mode.

Something is probably wrong with your machine's setup.

What do you see from this command?

Code: 
cat /etc/udev/rules.d/49-teensy.rules
Click to expand...

That gives me;
Code: 
# UDEV Rules for Teensy boards, http://www.pjrc.com/teensy/
#
# The latest version of this file may be found at:
#   http://www.pjrc.com/teensy/49-teensy.rules
#
# This file must be placed at:
#
# /etc/udev/rules.d/49-teensy.rules    (preferred location)
#   or
# /lib/udev/rules.d/49-teensy.rules    (req'd on some broken systems)
#
# To install, type this command in a terminal:
#   sudo cp 49-teensy.rules /etc/udev/rules.d/49-teensy.rules
#
# After this file is installed, physically unplug and reconnect Teensy.
#
ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="04[789B]?", ENV{ID_MM_DEVICE_IGNORE}="1", ENV{ID_MM_PORT_IGNORE}="1"
ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="04[789A]?", ENV{MTP_NO_PROBE}="1"
SUBSYSTEMS=="usb", ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="04[789ABCD]?", MODE:="0666"
KERNEL=="ttyACM*", ATTRS{idVendor}=="16c0", ATTRS{idProduct}=="04[789B]?", MODE:="0666"
#
# If you share your linux system with other users, or just don't like the
# idea of write permission for everybody, you can replace MODE:="0666" with
# OWNER:="yourusername" to create the device owned by you, or with
# GROUP:="somegroupname" and mange access using standard unix groups.
#
# ModemManager tends to interfere with USB Serial devices like Teensy.
# Problems manifest as the Arduino Serial Monitor missing some incoming
# data, and "Unable to open /dev/ttyACM0 for reboot request" when
# uploading.  If you experience these problems, disable or remove
# ModemManager from your system.  If you must use a modem, perhaps
# try disabling the "MM_FILTER_RULE_TTY_ACM_INTERFACE" ModemManager
# rule.  Changing ModemManager's filter policy from "strict" to "default"
# may also help.  But if you don't use a modem, completely removing
# the troublesome ModemManager is the most effective solution.
 
i'm not sure if it's necessary or the right incantation, but have you tried sudo systemctl restart udev.service that restarts the udev service so it sees any changes to rules.d/
 
i'm having trouble understanding your IDE output :confused:
/home/ryan/ryan_stuff/projects/microprocessing/arduino-1.8.12/hardware/teensy/../tools/teensy_post_compile -file=test_serial.ino -path=/tmp/arduino_build_274178 -tools=/home/ryan/ryan_stuff/projects/microprocessing/arduino-1.8.12/hardware/teensy/../tools -board=TEENSY2 -reboot -port=/dev/ttyS4 -portlabel=/dev/ttyS4 -portprotocol=serial

why is it saying ttyS4 ??? i would expect ttyACM0 ??? what are you selecting in IDE Tools > Port ? my verbose load output shows

/home/linux/arduino-1.8.11/hardware/teensy/../tools/teensy_post_compile -file=sketch_mar16a.ino -path=/tmp/arduino_build_954583 -tools=/home/linux/arduino-1.8.11/hardware/teensy/../tools -board=TEENSY2 -reboot -port=/sys/devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.4 -portlabel=/dev/ttyACM0 Serial -portprotocol=Teensy

can you attach a photo of your teensy 2 with cables attached?
 
My God, you sweet, sweet genius. I changed the port to `/dev/ttyACM0 Serial (Teensy2.0)` (it _was_ on `/dev/ttyS4`). Now I am seeing serial monitor output after upload! I still get that weird "An error occurred ..." line in Arudino IDE, but everything appears to be working regardless!
 
r.schuster3 said:
I still get that weird "An error occurred ..." line in Arudino IDE, but everything appears to be working regardless!
Click to expand...

you might do a ps uax | grep tee and look for orphaned teensy tasks that might need to be killed, in particular teensy_ports -J2
 
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