https://bugs.kde.org/show_bug.cgi?id=460332
Bug ID: 460332
Summary: Monitor is disabled on resume from suspend/sleep
Classification: Plasma
Product: KScreen
Version: 5.25.90
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: kded
Assignee: kscreen-bugs-n...@kde.org
Reporter: br...@southcape.org
Target Milestone: ---
SUMMARY
On a machine running the KDE Neon and the NVidia 515.65.01 driver in X11, with
a dual-monitor setup (1 HDMI, 1 DP), the monitor connected to the DP is always
disabled on resume from suspend. I don't have another system to test whether
this behavior is exhibited on non-NVidia hardware. I have wiped
~/.local/share/kscreen with no change in behavior. However, the ubuntu-desktop
environment does not exhibit this behavior.
On resume, when the DP monitor is disabled, it can be re-enabled manually in
the System Settings Display Configuration page. However, this must be done on
every resume from suspend. Prior to doing this, the desktop area will "scroll"
the amount of pixels the second monitor would have provided, either
horizontally or vertically depending on the displays' orientations and layout
(like the old-school X11 virtual desktops that had more usable area than a
single monitor supported).
STEPS TO REPRODUCE
1. Use two monitors in any orientation, with an NVidia card.
2. Suspend the machine.
3. Resume the machine.
OBSERVED RESULT
The DisplayPort monitor is disabled upon resume and must be re-enabled in
System Settings.
EXPECTED RESULT
The DisplayPort monitor should remain in the same state it was in prior to
resume.
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma: 5.26.0
(available in About System)
KDE Plasma Version: 5.26.0
KDE Frameworks Version: 5.98.0
Qt Version: 5.15.6
ADDITIONAL INFORMATION
This behavior is not experienced within the ubuntu-desktop environment, either
in X11 or Wayland. This suggests the issue is not within the NVidia drivers and
is not specific to the X11 protocol.
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