https://bugs.kde.org/show_bug.cgi?id=500942
Bug ID: 500942
Summary: All screens go black when second external monitor
connected
Classification: Plasma
Product: kwin
Version: 6.3.2
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Keywords: drkonqi
Severity: crash
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: hen...@kauhanen.se
Target Milestone: ---
Application: kwin_wayland (6.3.2)
ApplicationNotResponding [ANR]: false
Qt Version: 6.8.2
Frameworks Version: 6.11.0
Operating System: Linux 6.13.5-200.fc41.x86_64 x86_64
Windowing System: Wayland
Distribution: "Fedora release 41 (Forty One)"
DrKonqi: 6.3.2 [CoredumpBackend]
-- Information about the crash:
I have a system with Dell 7470 laptop, its docking station and to the docking
station connected a Dell UltraSharp UP2716D via Displayport.
>From the displayport output on this monitor, there is another monitor Dell
U2413.
This setup has been working for years with fedora + KDE plasma.
On updating today (haven't done it for a few days, so updates from perhaps 25th
of february onwards may be included), on initial reboot the screens go black
after a few initial screens (shows Dell on bootup and fedora booting).
When I disconnect the external screens I can log in to KDE plasma as normal on
the laptop built in monitor.
I can then connect the UP2716D (without the U2413 connected) and it will show
the extended desktop.
When I try to connect the U2413 within a couple seconds all screens go black
and stay so for a while.
Now it seems to be a little unclear, what happens next.
Sometimes I get a login / desktop unlocking prompt after a while, but if I log
in everyting immediately goes black again.
(I have similar problems on a second computer too, a Dell 7400 with two Dell
U3219Q monitors connected via a Dell USB-C/Thunderbird docking station, but
that is not in this report. Just to indicate that it seems to be happening on
two sets of completely different hardware.)
The crash can be reproduced every time.
-- Backtrace (Reduced):
#5 KWin::DrmPipeline::prepareAtomicPresentation
(this=this@entry=0x56182ceae820, commit=0x56182e086910,
frame=std::shared_ptr<KWin::OutputFrame> (use count 1, weak count 0) = {...})
at
/usr/src/debug/kwin-6.3.2.1-1.fc41.x86_64/src/backends/drm/drm_property.cpp:153
#6 0x00007ff850714208 in KWin::DrmPipeline::present (this=0x56182ceae820,
frame=std::shared_ptr<KWin::OutputFrame> (use count 1, weak count 0) = {...})
at /usr/include/c++/14/bits/unique_ptr.h:193
#7 KWin::DrmPipeline::present (this=this@entry=0x56182ceae820,
frame=std::shared_ptr<KWin::OutputFrame> (use count 1, weak count 0) = {...})
at
/usr/src/debug/kwin-6.3.2.1-1.fc41.x86_64/src/backends/drm/drm_pipeline.cpp:51
#8 0x00007ff850716002 in KWin::DrmOutput::present (this=0x56182ceb0af0,
frame=std::shared_ptr<KWin::OutputFrame> (use count 1, weak count 0) = {...})
at
/usr/src/debug/kwin-6.3.2.1-1.fc41.x86_64/src/backends/drm/drm_output.cpp:326
#9 0x00007ff850460e03 in KWin::WaylandCompositor::composite
(this=0x56182cf8d4b0, renderLoop=<optimized out>) at
/usr/src/debug/kwin-6.3.2.1-1.fc41.x86_64/src/compositor_wayland.cpp:448
Reported using DrKonqi
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