Window shift to left side if I watch video in fullscreen on a vertical monitor.

mpv Information

mpv v0.40.0-119-g1d1535ff9 Copyright © 2000-2025 mpv/MPlayer/mplayer2 projects
libplacebo version: v7.351.0 (v7.351.0)
FFmpeg version: N-119712-g43a69886b2
FFmpeg library versions:
   libavcodec      62.3.101
   libavdevice     62.0.100
   libavfilter     11.0.100
   libavformat     62.0.102
   libavutil       60.3.100
   libswresample   6.0.100
   libswscale      9.0.100

Other Information

- Linux version:Arch Linux
- Kernel Version:Linux laichiaheng 6.14.7-zen2-1-zen #1 ZEN SMP PREEMPT_DYNAMIC Thu, 22 May 2025 05:37:13 +0000 x86_64 GNU/Linux
- GPU Model:0b:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Navi 22 [Radeon RX 6700/6700 XT/6750 XT / 6800M/6850M XT] [1002:73df] (rev c0)
- Mesa/GPU Driver Version:OpenGL version string: 4.6 (Compatibility Profile) Mesa 25.1.1-arch1.1
- Window Manager and Version:6.3.90-2
- Source of mpv:AUR
- Latest known working version:I don't know.
- Issue started after the following happened:I rotate my monitor, the video in fullscreen shift to left side.

Reproduction Steps

If I rotate my monitor, and play the video in fullscreen, it shifts to left side, when I'm moving my mouse, it becomes normal.
It only happens to vo=gpu and vo=gpu-next, it doesn't happen to vo=dmabuf-wayland, it doesn't happen to VLC either.

1. Rotate the screen in System Setting.
2. Play videos with --vo=gpu or --vo=gpu-next in fullscreen.
3. Don't move your mouse.
   

Expected Behavior

Playing like before or --vo=dmabuf-wayland

Actual Behavior

Log File

fullscreen.txt

Sample Files

https://drive.google.com/file/d/1Ns3pO0wKt61sgf-XfhBPQ6BPChQX8qvt/view?usp=sharing

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 with the attached fullscreen.txt log and reproduce the issue after rotating the monitor. Compare fullscreen behavior for vo=gpu and vo=gpu-next against vo=dmabuf-wayland, focusing on the difference before and after mouse movement. Done means rotated vertical displays keep fullscreen video correctly positioned without mouse input.