https://bugs.kde.org/show_bug.cgi?id=466035
Bug ID: 466035
Summary: Multi monitors setup crashes when monitors are (hard)
powered off
Classification: Plasma
Product: KScreen
Version: 5.27.0
Platform: Neon
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: OSD
Assignee: kscreen-bugs-n...@kde.org
Reporter: rs...@mailbox.org
Target Milestone: ---
Created attachment 156460
--> https://bugs.kde.org/attachment.cgi?id=156460&action=edit
Journal output
SUMMARY
I have a dual monitor setup (4k primary + FHD). Both monitors are connected to
a power strip with a switch.
When I turn them off and on again, KDE disables the primary 4k monitor and only
the FHD monitor is active. The other monitor goes black and only the mouse is
visible. (This does not happen when I switch off the monitors using the power
button.)
When I press CTL+ALT to switch to the console, both monitors are reactivated,
but only in console mode.
When I restart sddm in this mode, sddm is displayed correctly on both monitors.
When I log in, the primary 4k monitor is disabled and the desktop launches on
the FHD monitor.
When I try to enable the 4k monitor via the KDE display manager, nothing
happens, or the monitor is enabled and KDE crashes, then reverts back to the
FHD monitor.
When I reboot, nothing changes.
If I start the nvidia x server settings and enable the 4k monitor, it works
again.
This bug appeared last year. Affected versions are definitely 5.27, 5.26 and
5.25. There are probably more affected versions, but I cannot remember which
version broke it. It worked fine in the past. The issue appeared with Neon
20.04 and stayed with 22.04.
The only clue I have is that the German translation of the display manager
utility was missing after the update when the bug first appeared.
I have attached the journal log between the point where I turn off the
monitors, turn them back on and log in via console to save the log.
STEPS TO REPRODUCE
1. Hard power off the monitors
2. Turn them on again
OBSERVED RESULT
Primary 4k monitor gets disabled
Secondary FHD monitor becomes primary
EXPECTED RESULT
Monitor setup restored
SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.27
KDE Plasma Version: 5.27.0
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Kernel Version: 5.19.0-32-generic (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 1700 Eight-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 1080 Ti/PCIe/SSE2
Manufacturer: Gigabyte Technology Co., Ltd.
Product Name: AX370-Gaming 5
Nvidia driver: 510.47.03-0ubuntu1
ADDITIONAL INFORMATION
xrandr output when it is working:
Screen 0: minimum 8 x 8, current 5760 x 2160, maximum 32767 x 32767
DVI-D-0 connected 1920x1080+3840+0 (normal left inverted right x axis y axis)
510mm x 290mm
1920x1080 60.00*+
1680x1050 59.95
1600x900 60.00
1440x900 59.89
1400x1050 59.98
1280x1024 75.02 60.02
1280x800 59.81
1280x720 60.00
1152x864 75.00
1024x768 75.03 60.00
800x600 75.00 60.32 56.25
640x480 75.00 59.94
HDMI-0 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis)
600mm x 340mm
3840x2160 60.00*+ 30.00
1920x1080 60.00 59.94
1600x900 60.00
1280x1024 60.02
1280x800 59.81
1280x720 60.00 59.94
1152x864 59.96
1024x768 60.00
800x600 60.32
720x480 59.94
640x480 59.94 59.93
DP-3 disconnected (normal left inverted right x axis y axis)
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