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
> User Eighth_Doctor on LiberaChat reporting that this might have to do with display enumeration That is correct. We have to load the GPU to be able to list its outputs; when there are no outputs we do unload it again though. I double checked and there is a bug in the gpu removal code but it's pretty unlikely to cause this as it's mostly a memory leak.
Git commit fbff8636b9a1d21772fccaacb8b2a55aa517aa90 by Xaver Hugl. Committed on 24/08/2021 at 12:36. Pushed by zamundaaa into branch 'master'. platforms/drm: fix gpu removal As soon as m_backends.removeOne(*it) returns, "it" no longer points to the same value. M +3 -3 src/plugins/platforms/drm/egl_multi_backend.cpp https://invent.kde.org/plasma/kwin/commit/fbff8636b9a1d21772fccaacb8b2a55aa517aa90
Git commit 5611c905cea800ee57ba5690c3ec75b086258612 by Xaver Hugl. Committed on 24/08/2021 at 12:37. Pushed by zamundaaa into branch 'Plasma/5.22'. platforms/drm: fix gpu removal As soon as m_backends.removeOne(*it) returns, "it" no longer points to the same value. (cherry picked from commit fbff8636b9a1d21772fccaacb8b2a55aa517aa90) M +3 -3 src/plugins/platforms/drm/egl_multi_backend.cpp https://invent.kde.org/plasma/kwin/commit/5611c905cea800ee57ba5690c3ec75b086258612
Is this still happening on Plasma 5.27?
(In reply to Zamundaaa from comment #4) > Is this still happening on Plasma 5.27? Hard for me to reproduce nowadays, because my distro switched to sddm-wayland since, and current power management features require the module to be loaded at all times (AFAIU). I'd say it's ok to close if nobody objects.
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!