https://bugs.kde.org/show_bug.cgi?id=490829
Bug ID: 490829
Summary: Use of nvidia-smi causes jittery desktop performance
with GSP enabled
Classification: Applications
Product: plasma-systemmonitor
Version: 6.1.3
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: ksysguard-b...@kde.org
Reporter: thehamb...@gmail.com
CC: ahiems...@heimr.nl, plasma-b...@kde.org
Target Milestone: ---
SUMMARY
Using a system monitor widget set to monitor NVIDIA GPU activity/stats causes
nvidia-smi to be opened repeatedly--however, this seems to be the cause of
hitching in the Plasma Wayland session with either NV drivers 555 or 560.
STEPS TO REPRODUCE
1. Using an NVIDIA GPU without `nvidia.NVreg_EnableGpuFirmware=0` set, have a
System Monitor sensor widget on a Plasma panel set to monitor said GPU.
2. Use the Wayland session--observe performance of window dragging or desktop
effects be slower and noticeably choppy.
OBSERVED RESULT
Plasma desktop performance appears choppy with bad performance, almost like
it's running at half the display refresh rate.
EXPECTED RESULT
Plasma desktop should be smooth.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kernel 6.9
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.4.0
Qt Version: 6.7.2
ADDITIONAL INFORMATION
Might be related to bug #487728 as it also only affects the Wayland session,
though hard to say if this is also a supporting cause to Wl plasmashell
crashes. Was suggested by an Nvidia contributor @
https://github.com/NVIDIA/open-gpu-kernel-modules/issues/538#issuecomment-2251021404
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