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Description
Describe the Bug
I believe there is a long-running bug in AVR suspend during PC sleep. It manifests visibly with GPIOs: RGB goes haywire, the board isn't responsive after the PC sleeps until a power cycle, and on the Bit-C the built-in LED turns on. The common workaround is to define NO_SUSPEND_POWER_DOWN in the config.h, but this also keeps the RGB, backlight, etc enabled when the host is put to sleep.
I've also seen a few cases where internal flash gets corrupted (at least on 32U4) and the board needed to be flashed again to bring it back to life. There have been a few attempts to work around and fix this issue, but despite that it pops back up from time to time. When I was originally digging into this, it seemed possible that it was related to clocks since almost all clocks are disabled during power-down, but I never got to a root cause. @drashna advised me to open this issue to brainstorm/track mitigations. Disabling the AVR deep sleep by undefining WDT_vect (required to enter sleep, see https://github.com/qmk/qmk_firmware/blob/master/platforms/avr/suspend.c#L18) fixes this but is a hack.
A few possible examples: https://github.com/qmk/qmk_firmware/issues/19192 https://github.com/qmk/qmk_firmware/issues/14127 https://github.com/qmk/qmk_firmware/issues/6822 https://github.com/qmk/qmk_firmware/issues/6726 https://github.com/qmk/qmk_firmware/issues/5239
There's a separate class of issue related to sleep on M1 Macs -- this is different from that one. The two don't seem to be related.
Keyboard Used
No response
Link to product page (if applicable)
No response
Operating System
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qmk doctor Output
No response
Is AutoHotKey / Karabiner installed
- AutoHotKey (Windows)
- Karabiner (macOS)
Other keyboard-related software installed
No response
Additional Context
No response