https://bugs.kde.org/show_bug.cgi?id=463625
Bug ID: 463625
Summary: Blank screen is displayed across all monitors when
DisplayPort monitor is enabled,
Classification: Plasma
Product: kwin
Version: 5.26.4
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: xrandr
Assignee: kwin-bugs-n...@kde.org
Reporter: goblyos.be...@yahoo.com
Target Milestone: ---
SUMMARY
When the primary DisplayPort monitor is enabled, all screens go blank and
display only a cursor. Moving the cursor to the top left corner will correctly
display the window overview screen on all monitors.
Furthermore, after rebooting an installed system that has this issue, it will
automatically disable the DP monitor and attempts to re-enable it will either
be completely ignored (automatically resets after clicking off the tab in
system settings) or in rare cases cause system settings to crash (cannot
currently reproduce for crash dump). In the event it does work, it produces the
above mentioned issue.
STEPS TO REPRODUCE
1. Run an up to date version (as of 2022-12-30) of Fedora KDE or the latest ISO
(Fedora-KDE-Live-x86_64-37-1.7.iso or F37-KDE-x86_64-LIVE-20221215.iso) on a
system with an RTX 2080 graphics card and one monitor attached with DisplayPort
and another with HDMI.
2. Log into Plasma (either X11 or Wayland).
3. Enable DisplayPort monitor if it's disabled.
OBSERVED RESULT
Both screens are completely blank if DisplayPort monitor is enabled.
EXPECTED RESULT
Both screens display their respective desktops.
SOFTWARE/OS VERSIONS
Linux: 6.0.15-300.fc37.x86_64
KDE Plasma Version: 5.26.4
KDE Frameworks Version: 5.101.0
Qt Version: 5.15.7
ADDITIONAL INFORMATION
The issue is seemingly only reproducible with Fedora KDE, as neither Fedora
Workstation nor KDE Neon exhibit this behavior. The issue occurs with both the
proprietary NVIDIA drivers (installed through
akmod-nvidia-525.60.11-1.fc37.x86_64,
xorg-x11-drv-nvidia-525.60.11-1.fc37.x86_64 and
xorg-x11-drv-nvidia-cuda-525.60.11-1.fc37.x86_64) and nouveau, as well as with
a new DP cable. The issue first occurred after waking the computer from sleep,
however I suspect it to be a coincidence, as the same happens on a live ISO as
well.
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