Wayland: dropped frames, unstable refresh rate with adaptive sync; video freezes in fullscreen

mpv Information

mpv v0.39.0-dirty Copyright © 2000-2024 mpv/MPlayer/mplayer2 projects
built on Mar 13 2025 08:13:20
libplacebo version: v7.349.0
FFmpeg version: n7.1
FFmpeg library versions:
libavcodec      61.19.100
libavdevice     61.3.100
libavfilter     10.4.100
libavformat     61.7.100
libavutil       59.39.100
libswresample   5.3.100
libswscale      8.3.100

Other Information

- Linux version: Garuda Linux
- Kernel Version: 6.13.7-zen1-1-zen
- GPU Model: Radeon RX 7800 XT
- Mesa/GPU Driver Version: Mesa 25.0.1-arch1.2
- Window Manager and Version: kwin 6.3.3.1-1
- Source of mpv: arch repo
- Latest known working version: any version on X11
- Issue started after the following happened: switching to wayland session

Reproduction Steps

For me, just switching to wayland session with Garuda and Plasma 6 was enough. I added gpu-context=waylandvk to try and fix the issue but to no avail. I tried several videos encoded in either h264 or h265.

These are my settings:

hwdec=auto-copy
profile=gpu-hq
gpu-context=waylandvk
video-sync=display-resample
opengl-es=no

scale=ewa_lanczos
dscale=mitchell
correct-downscaling
sigmoid-upscaling

interpolation
tscale=oversample

Expected Behavior

Generally, I get less than 10 mistimed or dropped frames over the course of a 45-60 minute video and the refresh rate stays at 144Hz for the duration in X11. Also, no fullscreen video freeze in X11.

Actual Behavior

The refresh rate fluctuates over time and a significant portion of frames are mistimed, delayed, or dropped . If I turn off adaptive sync in KDE's display configuration menu, this issue disappears. Whether or not I have adaptive sync on, however, the video will freeze after a second or two in fullscreen with audio continuing to play unless I move the mouse. If I constantly move the mouse, video playback does not stop.

Log File

output.txt

Sample Files

No response

I carefully read all instruction and confirm that I did the following:

• I tested with the latest mpv version to validate that the issue is not already fixed.
• I provided all required information including system and mpv version.
• I produced the log file with the exact same set of files, parameters, and conditions used in "Reproduction Steps", with the addition of --log-file=output.txt.
• I produced the log file while the behaviors described in "Actual Behavior" were actively observed.
• I attached the full, untruncated log file.
• I attached the backtrace in the case of a crash.

Start by reviewing the attached output.txt alongside the reported Wayland, adaptive-sync, fullscreen, and gpu-context=waylandvk conditions. Reproduce with the listed mpv settings on Plasma 6, comparing adaptive sync enabled and disabled; done means stable refresh and frame timing with no fullscreen video freeze while audio continues.