Laptop suspend broken since 6.7.6
Trying to suspend on kernels newer than 6.7.6 turns off the screen, but the fan, power LED and keyboard backlight remain on. I have to forcefully power-off by long pressing the power button to leave this state, I also tried REISUB emergency reboot but it didn't work.
With the help of the Arch forums (thread), someone was able to pinpoint the breaking commit. I was able to confirm this by building the 6.7.7 kernel with the commit reverted, more details and logs are in the forum thread.
#3241 (closed) Seems related.