NVIDIA / NVIDIA/open-gpu-kernel-modules
KDE and GNOME wayland sessions high CPU usage with external displays
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- Dominant language
- C
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Description
NVIDIA Open GPU Kernel Modules Version
525.78.01
Does this happen with the proprietary driver (of the same version) as well?
Yes
Operating System and Version
Arch Linux
Kernel Release
6.1.4
Hardware: GPU
NVIDIA GeForce GTX 1660 Ti (UUID: GPU-1039f844-290a-8383-6bb3-75f30db7d7c5)
Describe the bug
When using a laptop and an external display both KDE and GNOME Wayland sessions have high CPU usage when doing anything/refreshing the external display.
dmesg spams NVRM osCreateOsDescriptorFromDmaBufPtr: osCreateOsDescriptorFromDmaBufPtr(): Error (86) while trying to import dma_buf!
I have built the driver with an os_dump_stacktrace() before the call to osCreateOsDescriptorFromDmaBufPtr, there's an attachment so the path that the driver takes to get there is visible
To Reproduce
- Connect external display
- See high CPU usage
Bug Incidence
Always
nvidia-bug-report.log.gz
More Info
No response
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the attached nvidia-stacktrace.txt and nvidia-bug-report.log.gz, then reproduce the issue by connecting an external display in a KDE or GNOME Wayland session. Trace the dma_buf import path associated with the reported NVRM error; done means external-display activity no longer causes high CPU usage or repeated dma_buf import errors.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- c, linux
- Domain
- computer-graphics, operating-systems
- Issue type
- Bug
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 20/100