https://bugs.kde.org/show_bug.cgi?id=494183
Bug ID: 494183
Summary: Regular black screen on second monitor when using
DisplayPort cable
Classification: Plasma
Product: kwin
Version: 6.1.5
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: mattr...@gmail.com
Target Milestone: ---
SUMMARY
I've found an issue where my second monitor goes black for approx. 750-1500ms
while I'm hooked up to my laptop with a USB-C to DisplayPort cable. The screen
then returns after the timeout, only for it to happen again in ~10 minutes.
Looking through journalctl, this line is always correlated with the blackout.
`Oct 05 22:19:58 m-laptop kwin_wayland[870]: kwin_scene_opengl: 0x2:
GL_INVALID_OPERATION in glDrawBuffers(unsupported buffer GL_BACK_LEFT)`
There's sometimes some extra parts output, this one about plugin not supporting
raise():
`Oct 05 22:28:22 m-laptop kwin_wayland[870]: This plugin does not support
raise()
Oct 05 22:28:22 m-laptop kwin_wayland[870]: kwin_scene_opengl: 0x2:
GL_INVALID_OPERATION in glDrawBuffers(unsupported buffer GL_BACK_LEFT)
`
I don't have the info for it, but there's also a log about something about the
aspect ratio not being what was expected - I'll update the report if I see that
again.
STEPS TO REPRODUCE
1. Connect a laptop to a screen with a USB-C to DisplayPort cable
2. Use the computer for ~10-15 minutes
OBSERVED RESULT
You should get the blackout for a second, it's fairly regular.
EXPECTED RESULT
Probably that it doesn't do that.
SOFTWARE/OS VERSIONS
➜ ~ kinfo
Operating System: Arch Linux
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.6.0
Qt Version: 6.7.2
Kernel Version: 6.10.10-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-8650U CPU @ 1.90GHz
Memory: 15.5 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 620
ADDITIONAL INFORMATION
I've tried fiddling with the display options, setting scale from 125% to 100%,
changing the refresh rate from 120, 100, 60Hz.
I have also just found a HDMI cable, so I'll find out if that's doing it also.
If any further info would be helpful, let me know.
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