https://bugs.kde.org/show_bug.cgi?id=470329
Bug ID: 470329
Summary: Monitor power on / off results in stolen input and
broken xwayland clients
Classification: Plasma
Product: kwin
Version: 5.27.2
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: multi-screen
Assignee: kwin-bugs-n...@kde.org
Reporter: and...@posteo.net
Target Milestone: ---
SUMMARY
***
CPU: AMD 5950x
GPU: 0a:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Navi 31 [Radeon RX 7900 XT/7900 XTX] [1002:744c] (rev c8) Sapphire
Nitro+
System Memory: 32GB DDR4
Display(s): DELL 27" 2560x1440@144 DisplayPort and SAMSUNG 75" 3840x2160@120
HDMI
Debian 12 Bookworm
Kernel: 6.3.3-x64v3-xanmod1 #0~20230517.05b3a98
***
STEPS TO REPRODUCE
1. Have the HDMI display screen powered off while Displayport screen is
Primary and active, powered on
2. Start Steam, start a game from library via Proton (Wine)
3. Play the game normally
4. Turn on the HDMI display from remote, the whole desktop flickers, the game
client window moves and freezes (depending on game) and loses input.
5. Need to stop (terminate) the frozen game window client and restart
OBSERVED RESULT
First, desktop flickers and all windows (that maybe are on powered off screen)
move to primary screen and then back to screen that was powered on.
It seems some xwayland clients are broken, getting freezed and losing focus.
Focus is lost from active window (screen).
EXPECTED RESULT
Screen powers on and displays the configured desktop for it
No flickering or minimal flickering, no Window moving from active screen to the
other and back.
No changing focus from screen to screen.
SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux 12
KDE Plasma Version: 5.27.2
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Kernel Version: 6.3.3-x64v3-xanmod1 (64-bit)
Graphics Platform: Wayland
Processors: 32 × AMD Ryzen 9 5950X 16-Core Processor
Memory: 31,3 GiB of RAM
Graphics Processor: AMD Radeon Graphics
Manufacturer: ASUS
ADDITIONAL INFORMATION
Testing on Windows I see a short flicker when trying the same operation of
turning a screen on / off but the windows do not move.
Testing on Linux, this happens, have observed this desktop flicker when turning
a display on and the current windows getting moved from screen to screen also
while trying Fedora 38 KDE Live 1.6.iso.
Not sure if this strictly a KDE Kwin/Plasma issue, I think it's maybe amd/drm
something, will raise another issue there.
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