https://bugs.kde.org/show_bug.cgi?id=500955
Bug ID: 500955
Summary: NVIDIA dGPU with RTD3 support could not be turned off
due to plasmashell using the GPU in Wayland session
Classification: Plasma
Product: plasmashell
Version: git-stable-Plasma/6.3
Platform: openSUSE
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: samdu...@icloud.com
CC: k...@davidedmundson.co.uk
Target Milestone: 1.0
SUMMARY
NVIDIA dGPU on a laptop with RTD3 power management cannot be powered off in
Plasma 6.3+ (Wayland only session, sddm also runs on Wayland)
STEPS TO REPRODUCE
1. Install the NVIDIA closed-source driver and set up RTD3 power management
according to the official guide.
2. Reboot and log in to Plasma.
3. Wait. During the wait, check the dGPU suspend time using:
watch -n 2 cat /sys/bus/pci/devices/0000:01:00.0/power/runtime_suspended_time
OBSERVED RESULT
The suspend time do not accumulate. -> dGPU doesn't power off.
EXPECTED RESULT
The suspend time should be accumulating. -> dGPU is turned off.
SOFTWARE/OS VERSIONS
Linux version: openSUSE Tumbleweed 20250228, kernel 6.13.4
KDE Plasma Version: 6.3.2
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
NVIDIA driver version: 570.124.04 (seems not matter since version 550 also had
this issue)
ADDITIONAL INFORMATION
* The kernel module parameter nvidia.NVreg_EnableGpuFirmware=0 is set.
* Powering off worked in Plasma 6.2 with kernel 6.12 and NVIDIA driver 550.
* Powering off works in Weston and Hyprland with the same Linux version and
NVIDIA drivers.
* Checking ~~~ fuser -v /dev/nvidia* ~~~ gives:
/dev/nvidia0: user 3873 F...m plasmashell
/dev/nvidiactl: user 3873 F...m plasmashell
/dev/nvidia-uvm: user 3873 F.... plasmashell
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