Comment # 18 on bug 111213 from Ilia Mirkin

I've pushed a change to mesa which disables the compute paths for the video
compositor on nouveau (well, basically just enabled for AMD). Unfortunately it
was relying on AMD-specific features. We probably could have implemented these,
but the benefits are dubious, so I didn't want to bother...

This also seems to fix the assertion in libdrm, which is probably triggerable
in more general ways, but oh well.

https://cgit.freedesktop.org/mesa/mesa/commit/?id=958390a9bf8904522a50f8e9c26c50c96179c183

commit 958390a9bf8904522a50f8e9c26c50c96179c183
Author: Ilia Mirkin <imirkin@alum.mit.edu>
Date:   Sat Aug 17 12:13:34 2019 -0400

    gallium/vl: use compute preference for all multimedia, not just blit

    The compute paths in vl are a bit AMD-specific. For example, they (on
    nouveau), try to use a BGRX8 image format, which is not supported.
    Fixing all this is probably possible, but since the compute paths aren't
    in any way better, it's difficult to care.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111213
    Fixes: 9364d66cb7 (gallium/auxiliary/vl: Add video compositor compute
shader render)
    Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
    Reviewed-by: Marek Ol<C5><A1><C3><A1>k <marek.olsak@amd.com>