Wakeup Computer from S3 Suspend

[camrbuss]

I am having difficulty getting my keyboard to wakeup my computer from an S3 suspend.

I am running Linux Kernel 5.10 and have a custom STM32F072 keyboard and can enter sleep with the MediaSleep keycode, but cannot seem to wake my computer with a button press. QMK on the same keyboard does wake up my machine, so I do not believe it is a hardware issue. I also tested with the Keyseebee firmware after just changing the pins, and still was unable to wake my machine.

Has anyone else had this issue? I looked into the stm32-usbd repository for suspend and resume but am not sure if those are even the correct functions to call.

BTW amazing library! I love the new CustomAction functionality for entering DFU.

[TeXitoi]

Sorry no idea. But I doubt that stm32-usbd suspend and resume are related, I think they are for usb protocol suspend/resume.

[camrbuss]

I looked into QMK and it seems that it calls usb_lld_wakeup_host from chibios which sets the CNTR register with the RESUME bit for 2 milliseconds (USB standard states 1ms-15ms) and then clears the bit.

As you mentioned, this is not what the stm32-usbd resume or suspend is doing as that has to do with the LP_MODE bit, which I believe has more to do with the device than the host.

I am thinking this should be a part of stm32-usbd and not keyberon. Should I open an issue there?

What are other keyberon users doing to wake their computer from suspend? Power button?

[TeXitoi]

If that's dedicated register access, yes it should go in stm32-usbd.

I personally use a laptop, so opening lid wake up the computer.

[camrbuss]

Created stm32-usbd issue to capture this.