https://bugs.kde.org/show_bug.cgi?id=513276
Bug ID: 513276
Summary: Left and right monitors turn black for a few seconds
after returning from having screens turned off
Classification: Plasma
Product: kwin
Version First 6.5.4
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
After having returned from having the screens turned off via the kde feature
"Turn screens off", in a triple monitor setup, left and right monitors (maybe
more precisely non primary monitors, actually, no matter where they're put)
turn black for a few seconds, then sometimes resume displaying output,
sometimes don't.
STEPS TO REPRODUCE
Guaranteed way to have it happen :
1. Have firefox maximized on the center monitor.
2. Turn the screens off via the kde feature to turn them off.
3. Turn them back on (I move my mouse around and it wakes the computer up).
4. Wait a few seconds for all your monitors to properly turn on by themselves.
5. Using the window decoration, drag the firefox window to make it windowed.
Alternative way to trigger to bug:
1. Turn the screens off.
2. Turn them back on (I move my mouse around and it wakes the computer up).
3. Wait a while, or move your cursor to the left monitor and the black screen
will trigger as soon as the cursor reaches the left screen.
OBSERVED RESULT
Left and right screens will turn off for a few seconds, then sometimes turn
back on, sometimes not. If the bug happens whilst the cursor is on the middle
screen, the cursor (and maybe whole system) will stutter. When display is not
resumed, turning the screens off again, then back on again, can fix the issue.
EXPECTED RESULT
None of the above happening.
SOFTWARE/OS VERSIONS
Operating System: CachyOS Linux
KDE Plasma Version: 6.5.4
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.1
Kernel Version: 6.18.0-3-cachyos (64-bit)
Graphics Platform: Wayland
GPU1 : AMD RX 9070 XT
GPU2 (headless, connected to a display, but not outputting by kwin): NVIDIA
GeForce GTX 1080 Ti
My screen setup :
Left : 1080p 60hz, 150% scaling, 10 bit colors.
Middle : 2160p 240hz with DSC (display stream compression), 150% scaling, 10
bit colors.
Right : 1080p 60hz, 100% scaling, 10 bit colors.
ADDITIONAL INFORMATION
Appeared in kwin 6.5.4, and is still present after the fix for
https://bugs.kde.org/show_bug.cgi?id=513151.
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