Intel Wayland - mistimed frames due to vsync jitter spikes
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Description
mpv version and platform
mpv 0.30 / -git
Linux
Sway-git wlroots-git / Weston
Intel Gemini Lake
Linux 5.3.7 / Mesa 19.2.2
Reproduction steps
Run mpv --no-config --video-sync=display-resample --hwdec=vaapi http://www.oc-burner.de/ftp/Videos/juddertest/juddertest_60.mp4 on a Gemini Lake 60Hz system.
Expected behavior
There should be perfect presentation like with Sway / Weston on AMD Radeon or on Intel Xorg with xf86-video-intel.
Actual behavior
There are vsync jitter spikes every few seconds, causing mistimed frames (stutter).
Log file
I assume that this is an issue of i915 kernel driver and needs to be reported to Intel.
Though it might be a good idea if an expert might share his/her view on this before.
@Dudemanguy @xantoz
Contributor guide
No contributing guide indexed for this repository
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 by reproducing the supplied mpv command on the stated Gemini Lake, Sway/Weston, Linux, and Mesa setup, then inspect output.txt for the timing data. Compare the behavior across the listed display environments to determine whether mpv or the i915 driver is responsible; the issue is resolved when the responsible component and a concrete next step are established.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- linux
- Domain
- desktop, operating-systems, performance
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100