[Nouveau] [Bug 105319] DRM: EVO timeout with kernel 4.15.x

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105319

--- Comment #32 from Mitch Humpherys <mitch.special at gmail.com> ---
I'm also affected by this bug on Fedora 29.

I hopped on the kernel mainline and started poking around and noticed that I
see this bug on 4.19 but not on 4.20.  So I bisected to find the commit in the
4.20 series that fixes the bug.  The fix appears to be:

commit 970a5ee41c72df46e3b0f307528c7d8ef7734a2e
Author: Ben Skeggs <bskeggs at redhat.com>
Date:   Wed Dec 12 16:51:17 2018 +1000

    drm/nouveau/kms/nv50-: also flush fb writes when rewinding push buffer

    Should hopefully fix a regression some people have been seeing since EVO
    push buffers were moved to VRAM by default on Pascal GPUs.

    Fixes: d00ddd9da ("drm/nouveau/kms/nv50-: allocate push buffers in vidmem
on pascal")
    Signed-off-by: Ben Skeggs <bskeggs at redhat.com>
    Cc: <stable at vger.kernel.org> # 4.19+


I can cherry pick just this commit on top of 4.19 and I get a stable system.

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