SUMMARY When running KWin on Wayland I can't resume from RAM anymore. I isolated this to only happening when the screens are switched off by "Screen Energy Saving" before the suspend is happening. STEPS TO REPRODUCE * Login into Plasma/Wayland session * Set Screen Energy Saving "Switch off after" to a low value like 1min * Wait until the screen(s) get(s) switched off * Run "sudo systemctl suspend" via SSH * Try to wake OBSERVED RESULT Computer does not wake from sleep. Fans turn on, kernel does not boot, as journalctl -b-1 only shows the point until suspend. EXPECTED RESULT Computer resumes from sleep. SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 5.21.2 KDE Frameworks Version: 5.79.0 Qt Version: 5.15.2 Kernel Version: 5.11.6-arch1-1 OS Type: 64-bit Graphics Platform: Wayland Processors: 24 × AMD Ryzen 9 3900X 12-Core Processor Memory: 31.3 GiB of RAM Graphics Processor: Radeon RX Vega ADDITIONAL INFORMATION I am using a GIGABYTE Radeon RX Vega 56 and the amdgpu kernel driver. I suspect a bug regarding KMS here. This might even be a kernel bug, though I only experience this bug with KWin on Wayland, never on X11.
I should add that this issue occurs *naturally* on my desktop, as it goes to sleep after just 10minutes of inactivity.
This is actually a kernel bug. Closing this. https://bugzilla.kernel.org/show_bug.cgi?id=212293