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DRM_FORMAT_XRGB2101010 dma buffer format is not handled causing mpv failure on Wayland with Iris Mesa's driver

mpv may use DRM_FORMAT_XRGB2101010 dma buffer however mutter doesn't handle it producing the following error:

[destroyed object]: error 7: failed to import supplied dmabufs: Unsupported buffer format 808669784

Setup:

  • gen8+ Intel GPU (Broadwell and later)
  • Mesa >= 19.1
  • Wayland
  • MESA_LOADER_DRIVER_OVERRIDE=iris in /etc/profile or .profile to enable iris driver
  • mpv --hwdec=no

In meta-wayland-dma-buf.c#L98-124 I don't see DRM_FORMAT_XRGB2101010 being handled, only DRM_FORMAT_ARGB2101010.

On the other hand mpv may use XRGB2101010 for the surface mpv/context_drm_egl.c#L766-L774. And by launching mpv with WAYLAND_DEBUG=1 I see dma buffer with format 808669784 is being created.

Original issue in Mesa: https://gitlab.freedesktop.org/mesa/mesa/issues/2220