Hello all noob member
I have similar problem as PickyBiker but mine ends there. Linux Mint.
I have some experience with Teensy 3.2 and decided to upgrade for a new project to Teensy 4.0
checked Arduino IDE 1.8.19 using Teensy Loader 1.56
I took it out of the box and re downloaded teensy rules for udev connected Micro B usb cable and
uploaded simple blink without delay sample sketch worked fine..so all good.
Later I decided to upload my project dry before inserting the device onto my circuit board and it wouldn't
connect I always check lsusb devices it wasn't there?
so I had a look at tail -f /var/log/syslog and it says attempt power cycle
usb port x cannot enable maybe cable is bad, cannot enumerate usb device
tried 3 good cables i had tested these exhaustively and works talking to an FTDI breakout and Pro mini
which confirms cables can and do talk load sketches etc.
Tried all different usb ports x and get the same result as above and the funny thing the teensy
boots up orange light flashes and press button turns to red etc.
Even tried the erase flash procedure as per the web page instruction .. still nothing
Any clues, I have contacted the seller's tech help line and they responded with similar cable problem issues
and suggested I ask in this forum.
Cheers ..Albert