On a Wayland session whose compositor hands clients no GPU device
(Cinnamon/Muffin 6.6.3 on Mint 22.3), Mesa falls back to llvmpipe and
libva-wayland's vaInitialize segfaults inside mpv_render_context_create
the moment mpv is given the wl_display - the app silently closes when
playback starts. 2.14 was the first release to hit this because its
bundled libmpv is the first with VAAPI compiled in, and the device init
runs eagerly at render-context creation, so the hardware-decoding
toggle cannot avoid it.
Skip MPV_RENDER_PARAM_WL_DISPLAY when GL_RENDERER names a software
rasterizer: zero-copy Wayland interop does not exist on llvmpipe anyway,
and mpv's hwdec=auto still reaches the GPU through a DRM render node,
which works even on these sessions. Accelerated sessions keep the
zero-copy handoff unchanged. Verified in a container against Muffin and
weston on llvmpipe: the handle is withheld and playback works.
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