https://bugs.kde.org/show_bug.cgi?id=511618
Bug ID: 511618
Summary: kwin_wayland freezes on 2nd GPU hotplug
Classification: Plasma
Product: kwin
Version First 6.5.1
Reported In:
Platform: Debian unstable
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: core
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
My system has an IGD (i915) and a discrete GPU (nouveau).
My primary display is on the IGD.
The display output of the second GPU is working well and can be configured via
systems settings.
Detaching the discrete GPU is working fine.
But when attaching the discrete GPU back, then kwin_wayland freezes the hole
primary display.
Those are the only two messages logged:
kwin_wayland_wrapper[18462]: kwin_core: Failed to open /dev/dri/renderD129
device (No such device)
kwin_wayland_wrapper[18462]: kwin_wayland_drm: failed to open drm device at
"/dev/dri/renderD129"
After the hotplug event, udev sets the right acl for /dev/dri/card1 and
/dev/dri/renderD129.
Nevertheless the user is group video and render.
STEPS TO REPRODUCE
1. Send remove to discrete GPU: echo remove >
/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/uevent
kwin_wayland_wrapper[18462]: kwin_wayland_drm: Removing GPU "/dev/dri/card1"
2. Detach discrete GPU: rmmod nouveau
All is working fine so far.
3. Attach discrete GPU: modpobe nouveau
OBSERVED RESULT
Nouveau loads discrete GPU without any issue.
Primary display freezes. The session cannot be terminated via loginctl.
After killing the whole session and starting a new session, everything works
flawlessly.
The display output of the second GPU is also working well and can be configured
via systems settings.
EXPECTED RESULT
No session freeze.
Hotplug works out of the box.
SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux 13
KDE Plasma Version: 6.5.1
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2
Kernel Version: 6.17.0-amd64 (64-bit)
Graphics Platform: Wayland
ADDITIONAL INFORMATION
The reason why I hotplug my discrete GPU is to pass it through to a virtual
machine.
Nevertheless, I like to use discrete GPU when it's not passed through to a vm.
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