https://bugs.kde.org/show_bug.cgi?id=441372
Bug ID: 441372
Summary: optimus laptop: nvidia driver is unnecessarily
loaded/grabbed by kwin on an intel GPU session
Product: kwin
Version: 5.22.4
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: platform-wayland
Assignee: kwin-bugs-n...@kde.org
Reporter: rom1...@gmail.com
Target Milestone: ---
SUMMARY
(This indirectly causes my laptop to not suspend any more, which seems related
to https://bugzilla.rpmfusion.org/show_bug.cgi?id=6066)
As it appears, only on a Wayland session, the nvidia kernel driver gets loaded
even though I am not using the discrete GPU of my laptop
STEPS TO REPRODUCE
1. After a cold boot, from SDDM, jump to a non-graphical terminal and observe
that `lsmod | grep nvidia` returns nothing
2. Then, login into a KDE-Wayland session from SDDM, switch to the same
non-graphical terminal and observe that the same command indicates "nvidia" and
"nvidia_uvm" to be loaded
3. Note that `modprobe -r nvidia` fails with "modprobe: FATAL: Module nvidia is
in use."
4. Note from the system info that the session runs on intel and not actually on
nvidia
5. Log-out from the Wayland shell back into SDDM
6. Then, `modprobe -r nvidia` completes successfully
7. Log into an X11 shell, and observe that no nvidia driver is loaded
OBSERVED RESULT
The nvidia driver is unnecessarily loaded on Wayland
EXPECTED RESULT
The nvidia driver to be loaded only on demand (through PRIME_RENDER_OFFLOAD,
optirun & al.) on such a machine with a discrete GPU
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.13.10-200.fc34.x86_64/plasma-desktop-5.22.4-1.fc34.x86_64
KDE Frameworks Version: kf5-kwindowsystem-5.85.0-1.fc34.x86_64
Qt Version: qt5-qtbase-5.15.2-16.fc34.x86_64
ADDITIONAL INFORMATION
xorg-x11-drv-nvidia-470.63.01-1.fc34.x86_64
User Eighth_Doctor‎ on LiberaChat reporting that this might have to do with
display enumeration
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