https://bugs.kde.org/show_bug.cgi?id=501488
Bug ID: 501488
Summary: Plasma session doesn't open anymore when adding this
environment variable: QSG_RHI_BACKEND=vulkan
Classification: Plasma
Product: kwin
Version: 6.3.2
Platform: Debian unstable
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: core
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
Plasma session doesn't open anymore when adding this environment variable:
QSG_RHI_BACKEND=vulkan.
And there's also no error output.
STEPS TO REPRODUCE
1. Create this environment variable: QSG_RHI_BACKEND=vulkan
2. Reboot the computer
OBSERVED RESULT
With the automatic login that I have, after systemd's output finishes, the
Plasma session looks like it's loading normally...
But it gets stuck with a black background and no text output whatsoever.
The mouse is still visible and movable.
The keyboard is also working as I can press CTRL+ALT+F3, login, edit the
environment variables file to comment out this variable and then do a systemctl
reboot.
Which will succeed, as Plasma opens normally after reboot.
EXPECTED RESULT
1. The Plasma session opens normally, like before setting this environment
variable.
2. When Plasma session cannot open, for whatever reason, some text output with
the error should be shown, no matter how technical.
3. Maybe also add a recommendation to comment out some environment variables.
SOFTWARE/OS VERSIONS
Linux (Debian 13 - unstable repository)/KDE Plasma:
KDE Plasma Version: 6.3.2
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
Kernel Version: 6.12.17-amd64 (64-bit)
Mesa Version: 25.0.1-2
Graphics Platform: Wayland
HARDWARE SPECIFICATIONS
Hardware: Laptop Dell Inspiron 5770 (17" 1080p@60Hz screen)
CPU: Intel® Core™ i5-8250U CPU @ 1.60GHz (4 cores, 8 threads)
GPU 1: Intel® UHD Graphics 620 (main, Vulkan capable)
GPU 2: AMD Radeon R5 M465 Series
RAM: 8 GiB (7.7 GiB usable)
ADDITIONAL INFORMATION
Here is the documentation for this environment variable:
https://doc.qt.io/qt-6/qtquick-visualcanvas-scenegraph-renderer.html
It's for 6.8 and I'm using Qt 6.8.2 so it should work, considering that I'm
using an Intel iGPU and Mesa is also up to date.
And it worked the first time I tried it, which was Plasma 6.3.0.
It was broken in Plasma 6.3.1 or 6.3.2, I don't remember which one of them.
I know for sure it worked because MangoHUD, I have also installed for games
passing through DXVK to Vulkan, started appearing after reboot for Plasma
itself too. It was not working correcly (like continuously updating), but
anyway.
VKcube and games going through DXVK work ok, so don't think the Vulkan drivers
are the problem here.
The first time I could not enter the Plasma session, I had to reinstall the
whole OS as I could not link the existence of this environment variable with
the fact that I could not login, especially since it previously worked.
But after setting my environment variables again on the clean system and seeing
that boot is affected again I got the idea that it might be one of the
environment variables.
So, I had to comment out all environment variables one by one and reboot until
I found which was triggering this.
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