https://bugs.kde.org/show_bug.cgi?id=515309
Bug ID: 515309
Summary: Connecting external display to dGPU causes crash if
primary is the iGPU
Classification: Plasma
Product: kwin
Version First 6.5.5
Reported In:
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: egl
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 189064
--> https://bugs.kde.org/attachment.cgi?id=189064&action=edit
Backtrace of the latest kwin_wayland crash
SUMMARY
Whenever I connect an external display to my dGPU the whole kwin_wayland
crahses due to some EGL problem.
When the same display is connected to iGPU there is no issue.
I have no other issues with nvidia, prime works perfectly.
Tried enabling "fbdev", "modeset", neither helped.
Played around with a bunch of environment variables:
---------------------------------------------------------
KWIN_DRM_DEVICES=/dev/dri/card1
KWIN_OPENGL_INTERFACE=egl
__GLX_VENDOR_LIBRARY_NAME=mesa
GBM_BACKEND=nvidia-drm
__GL_GSYNC_ALLOWED=0
__GL_GSYNC_ALLOWED=0
---------------------------------------------------------
from these only "KWIN_OPENGL_INTERFACE=egl" helped, made the crash take longer,
but did not stop it
No issues on x11, SDDM seems to have managed the external display correctly as
well.
STEPS TO REPRODUCE
1. install nvidia closed v580.119.02
2. run kwin_wayland (can be completely emtpy with no session)
3. connect display to port that is known to use the dGPU
OBSERVED RESULT
kwin_wayland crashes and dumps core
EXPECTED RESULT
external display shows any content
SOFTWARE/OS VERSIONS
Linux:
Fedora 42
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0
Qt Version: 6.9.3
ADDITIONAL INFORMATION
Kernel: 6.18.6-100
Graphics Platform: Wayland
Graphics Processor 1: AMD Radeon 890M Graphics
Graphics Processor 2: NVIDIA GeForce RTX 4060 Laptop GPU
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