SUMMARY: Plasma flashes black around an app, causing everything except the focused app to flash black. This sometimes happens when resuming from suspend. STEPS TO REPRODUCE: 1. Open app 2. suspend computer 3. resume computer 4. enter password 5. Flashing black around app OBSERVED RESULT: Plasma will flash black around an app EXPECTED RESULT: Plasma does not flash and instead looks normal SOFTWARE/OS VERSIONS: Operating System: Arch Linux KDE Plasma Version: 5.24.0 KDE Frameworks Version: 5.90.0 Qt Version: 5.15.2 Kernel Version: 5.16.8-arch1-1 (64-bit) Graphics Platform: Wayland Processors: 8 × AMD Ryzen 5 3450U with Radeon Vega Mobile Gfx Memory: 5.7 GiB of RAM Graphics Processor: AMD Radeon Vega 8 Graphics
Hello, I tried with my laptop nvidia GPU plasma 5.24.0. I didnt notice any flask back. Could please provide a video? maybe you need to record it with a mobile. Regards
Created attachment 146658 [details] Video of issue Here is the video of the issue
Thanks for the video. I guess we need to wait until someone else can confirm this issue. From my side I cant reproduce it as I don't have an AMD GPU. Regards
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!
I can confirm this issue, I have both intel graphics and nvidia, but plasma runs on the intel card. I am also on arch linux. In addition to the behavior listed, sometimes the desktop also just stays black and there will only be rendering within a buffer around open windows. and taskbar widgets. Meta + D to the desktop fixes it immediately, presumably since it triggers a redraw. If I sleep my laptop by closing the lid and opening it, I can actually see the black background issue before even SDDM opens up (I think that is another bug, as for privacy/security concerns you shouldn't be able to get a glimpse of plasma on resume before SDDM takes over). Note that I am running both SDDM and plasma on Wayland.
Ah, I think I have some additional info. When I said sometimes it just stays black, it seems that that was because the mouse was moving. In fact, I've found out that it starts flashing as the mouse is moving, and stops flashing and will either stay on background, or black screen, as the mouse move stops. It is still solved by force showing the desktop with Meta + D. As a game developer I'm taking a guess here and saying that it might be a frame buffer issue, with one of the framebuffers not being updated with the desktop background - probably because of vsync?
(In reply to Marios from comment #7) > Ah, I think I have some additional info. When I said sometimes it just stays > black, it seems that that was because the mouse was moving. > Sorry, when the mouse was NOT moving.
This should be fixed in 5.24.5 and master.