https://bugs.kde.org/show_bug.cgi?id=480972
Bug ID: 480972
Summary: Adaptive sync causes external display to flicker black
Classification: Plasma
Product: kwin
Version: 5.93.0
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: hackand...@gmail.com
Target Milestone: ---
SUMMARY
With adaptive sync set to automatic, whenever I would fullscreen any app,
whether it would be an xwayland app, a qt app, a gtk app or firefox, it would
cause the display to turn itself off as if there was not any output, and
shortly come back afterwards, not giving it enough time to consider that there
is no signal and try to switch to another input source. Any sudden mouse
movements would cause it to flicker again.
I then set the adaptive sync to 'Always', and that has caused the display to
have this behaviour constantly, regardless of whether there was a fullscreen
window present or not. Switching to 'never' has resulted to this behavior not
occurring. The allow screentearing for fullscreen windows option did not affect
this whatsoever.
STEPS TO REPRODUCE
1. Connect external display to laptop via HDMI.
2. Close laptop lid.
3. Ensure adaptive sync is set to "Automatic".
4. Fullscreen anything, e.g. a youtube video.
OBSERVED RESULT
Display flickers black.
EXPECTED RESULT
See my content normally.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 6.7.3-x64v3-xanmod1
(available in About System)
KDE Plasma Version: 5.93.0
KDE Frameworks Version: 5.249.0
Qt Version: 6.7.0
ADDITIONAL INFORMATION
Built-in laptop display does not have adaptive sync.
16 × AMD Ryzen 7 5700U with Radeon Graphics
AMD Radeon Graphics
External Display is Acer Nitro VG271U
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