Can't play video on multiple displays using either fs-screen=all or using geometry

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Important Information

• mpv version

mpv 0.35.0-396-ga1a2e27f84 Copyright © 2000-2023 mpv/MPlayer/mplayer2 projects
 built on Wed May 24 07:24:32 2023
libplacebo version: v5.264.0-261-g541c85ec
FFmpeg version: N-110760-g0bce5590c3
FFmpeg library versions:
   libavutil       58.9.100
   libavcodec      60.14.101
   libavformat     60.5.100
   libswscale      7.2.100
   libavfilter     9.8.100
   libswresample   4.11.100

• Linux Distribution and Version

  Operating System: Ubuntu 20.04.6 LTS
            Kernel: Linux 5.15.0-72-generic
      Architecture: x86-64

• Source of the mpv binary Built using https://github.com/mpv-player/mpv-build with ./use-mpv-master

• If known which version of mpv introduced the problem Have found it to be down to v0.30

• Window Manager and version GNOME Shell 3.36.9

• GPU driver and version

# Tried both default mesa, and various other ppas
> glxinfo -B
name of display: :0
display: :0  screen: 0
direct rendering: Yes
Extended renderer info (GLX_MESA_query_renderer):
    Vendor: Intel (0x8086)
    Device: Mesa Intel(R) UHD Graphics 600 (GLK 2) (0x3185)
    Version: 22.2.0
    Accelerated: yes
    Video memory: 1797MB
    Unified memory: yes
    Preferred profile: core (0x1)
    Max core profile version: 4.6
    Max compat profile version: 4.6
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.2
OpenGL vendor string: Intel
OpenGL renderer string: Mesa Intel(R) UHD Graphics 600 (GLK 2)
OpenGL core profile version string: 4.6 (Core Profile) Mesa 22.2.0-devel (git-08da37035f)
OpenGL core profile shading language version string: 4.60
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile

OpenGL version string: 4.6 (Compatibility Profile) Mesa 22.2.0-devel (git-08da37035f)
OpenGL shading language version string: 4.60
OpenGL context flags: (none)
OpenGL profile mask: compatibility profile

OpenGL ES profile version string: OpenGL ES 3.2 Mesa 22.2.0-devel (git-08da37035f)
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20

Reproduction steps

Have 2 displays connected, and run mpv with any of the following options:

• --fs --fs-screen=all
• --geometry=3840x1080+0+0

Expected behavior

Video plays across both displays taking up all the space (3840x1080)

Actual behavior

Video resizes to play on a single display (1920x1080).

Log file

I've made 2 sets of log files - the first 2:

• fs.log - regular run with --fs (works as expected and plays on current screen)
• fs-screen-all.log - --fs --fs-screen=all doesn't work. Suddenly resizes back to 1920x1080 at line 463

And then I found using geometry I could play across both screens but not full height. It stopped working when going from 3840x432 to 3840x433.

• geometry432.txt - --geometry=3840x432 works as expected
• geometry433.txt - --geometry=3840x433 gets resized to 1920x1080 at line 544

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Here's another log file geometry433vvv.txt with -v -v -v to include even more info. It includes some XEvent: ... lines at around line 3250-3260, right before the resize to 1920x1080 that might be of interest.

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Also important.. it works fine dragging the window using the mouse to make it fill both displays.

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I couldn't find anything about adding bug bounty to this project, I hope it's allowed, but I'd like to add 500$ to this issue. Is there a specific service maintainers prefer or would direct payment by any means be fine?

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This is unfortunately still an issue with 0.38 :-(

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@Dudemanguy Would love to sponser someone to do the fix here - Would you be able to look at it, or know of other maintainers that could? I'd put in 2000$ as a starter!