I have several monitors. One monitor is connected with displayport, second monitor is connected with hdmi. The problem appears after sleep. The hdmi monitor stays in stand by mode (waiting for signal). STEPS TO REPRODUCE 1. Turn on PC. Both monitors show picture. 2. Turn PC to sleep. 3. Wake up PC. OBSERVED RESULT The picture is only shown on displayport monitor. On hdmi monitor there is no signal. EXPECTED RESULT Picture should be shown on both monitors. This is a regression. It worked normally previously. Unfortunately, I do not know exactly in which version it was broken. Probably a month ago. SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 5.27.4 KDE Frameworks Version: 5.105.0 Qt Version: 5.15.9 Graphics Platform: Wayland Graphics Processor: AMD Radeon RX 580 Series ADDITIONAL INFORMATION There are workarounds: 1) Turn off, then turn on the monitor by its power button. 2) Disable, then enable the hdmi monitor in system settings.
Please attach the output of drm_info (https://gitlab.freedesktop.org/emersion/drm_info), once for when the monitor works, and once for when it doesn't get a signal
Created attachment 158173 [details] drm_info before sleep (both monitors working)
Created attachment 158174 [details] drm_info after sleep (hdmi monitor not working)
It is some kind unstable. This time after first sleep the hdmi mon worked normal. Then after second sleep it was not working. Then after third sleep it was working again.
The kernel says both outputs are enabled, so this is a driver bug. It's most likely the same as https://gitlab.freedesktop.org/drm/amd/-/issues/2497, so please add your information there