Teensy 4.1 - Keyboard and Mouse HID output completely not working on Windows

[pickone]

Hi everyone,

I have a Teensy 4.1 and I'm having trouble getting any HID output to work on Windows.

My setup:

• Teensy 4.1 (bought from DigiKey, official distributor)
• Arduino IDE 2.3.8
• Teensyduino 1.6.0
• Windows 11
• USB Type: Keyboard + Mouse + Joystick
• Selected from Teensy Ports (not Serial Ports)
• Connected directly to PC (no hub)

The problem: Even the official example File → Examples → Teensy → USB_Keyboard → Simple does nothing. No text is typed anywhere.
Same with Mouse.move() — cursor never moves.
The Teensy appears correctly in Device Manager:

• 1 extra HID keyboard device
• 2 extra HID mouse devices

But absolutely no HID output reaches the PC.

What I already tried:

• Official USB_Keyboard Simple example
• Simple Keyboard.println with delay(5000)
• Simple Mouse.move in a loop
• Full flash restore (held button 15 seconds)
• Different USB cables
• Disabled antivirus
• Connected directly to PC without any USB hub
• Selected correct Teensy Port in IDE

What DOES work:

• USB Host reading works perfectly (I can read mouse data in Serial Monitor)
• Serial Monitor works fine

Any ideas what could be causing this?

Thank you!

 

[PaulStoffregen]

Usually the first troubleshooting step with Windows is to run Device Manager and see what it shows.

If the result is unclear, please remember we can't see your screen. A screenshot often helps more than just describing the info.

 

[pickone]

When teensy is not connected, I only see 8 HID keyboard devices and 6 HID-compliant mouse devices. After I insert teensy to USB, I see 9 keyboard and 8 mouse. But wait a sec... Yesterday I wrote this post, I removed teensy, now, after I turned on my computer, iserting teensy to see how many devices I have in device manager, I saw that teensy it is working... Strage...