Created attachment 129986 [details] journalctl output SUMMARY I have an interesting (read maddening and not obviously fixable) problem with a single machine that I want to run KDE on. The computer is hooked up to an audio video receiver (AVR) which is hooked up to a TV. Once the AVR and TV are shutoff for several minutes, turning them back on results in a visually corrupted desktop with horizontal line artifacts everywhere (icons, panels, applications, kickoff, etc.). The only thing that fixes the desktop is logging out and back in (or obviously restarting). kwin_x11 --replace or kquitapp5 plasmashell && kstart5plasmashell don't get rid of the corruption. It's an Intel based machine with discrete AMD graphics. While I'm submitting this issue based on a clean install of OpenSUSE Leap 15.2/Plasma 5.18.5, the same behavior exists on this machine using Tumbleweed, Kubuntu, and Neon. I fully suspect that the root cause is some weird power/link management issue in the AVR or TV, but I'm hoping there is some workaround I haven't tried, or that if it is a bug it can be fixed. GNOME works fine on this machine (either vanilla or with dash-to-dock), but I *strongly* prefer Plasma and I need any computers hooked up to TVs to have consistent DEs so my family can use them easily without me. STEPS TO REPRODUCE 1. This computer running and logged into a KDE Plasma session 2. Turn off TV (Sharp Aquos LC80LE642) and AVR (Onkyo TX-NR809) for ~10+ minutes 3. Turn TV and AVR back on OBSERVED RESULT Plasma desktop is visually corrupted. EXPECTED RESULT Plasma desktop is not visually corrupted. SOFTWARE/OS VERSIONS Linux/KDE Plasma: OpenSUSE Leap 15.2 (available in About System) KDE Plasma Version: 5.18.5 KDE Frameworks Version: 5.71.0 Qt Version: 5.12.7 ADDITIONAL INFORMATION Also occurs in the latest 5.19.x releases on Tumbleweed or Neon. Attaching inxi system info, journalctl output, and some pictures of the visual corruption. The system was booted at 14:15 in the journalctl output, the TV/AVR were shut off, and then I turned the TV/AVR back on and logged back in 30 minutes later 14:45.
Created attachment 129987 [details] system info
Created attachment 129988 [details] example of visual corruption in kickoff
Created attachment 129989 [details] example of visual corruption in kate
So even after restarting kwin and plasmashell you still see corruption in plasmashell? And it affects newly launched apps too?
Correct on both accounts. I've tried... kwin_x11 --replace plasmashell --replace kquitapp5 plasmashell && kstart5plasmashell (which is probably same as above) And none of these fix the visual corruption. Any newly launched apps continue to suffer the same visual corruption. A full logout and log back in is the only thing that clears it short of a reboot. I'm happy to run debug versions of components or enable extra logging etc. if we get to that point.
Bug is either in the graphics/OpenGL drivers, or even lower in the stack (ModeSettings/DRM/DRI drivers). I suggest to look for help in a Mesa graphics forum or bug tracker.