Mutter actually *does* support 10bpc, just not with zwp_linux_dmabuf_v1.
It seems that mesa will incorrectly try to use formats advertised by
wl_drm but not zwp_linux_dmabuf_v1.
https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4294 fixes
this for me.
** Changed in: mesa (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1868520
Title:
Clients fail to run with zwp_linux_dmabuf error (failed to import
supplied dmabufs: Unsupported buffer format 808669784)
[DRM_FORMAT_XRGB2101010]
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