USB wakeup is triggered instantly on sleep

[fd0]

I'm running tmk core with on my ErgoDox keyboard using the code from https://github.com/cub-uanic/tmk_keyboard, the repository with my code (and tmk_core cloned to tmk/core) can be found here: https://github.com/fd0/ergodox-tmk

I've tried to get USB wakeup working by pressing a button on the keyboard. So I enabled USB wakeup in the BIOS and OS (Linux), but now I'm unable to suspend: Wakeup is instantly triggered on suspend, as long as the keyboard is plugged in.

Any idea on what's going on here or how to debug this? Did I configure something wrong?

[tmk]

You can 'printf debug' using UART(or software UART) instead of USB. Use print_set_senchar() to change debug print destination, see https://github.com/tmk/tmk_keyboard/blob/master/keyboard/hhkb/rn42/main.c#L41 and https://github.com/tmk/tmk_keyboard/blob/master/keyboard/hhkb/rn42/suart.S .

Or buy cheap USB protocol analyzer if you are serious for this problem, it would be useful particularly in this situation.