[Nouveau] [Bug 64323] Severe misrendering in Left 4 Dead 2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=64323

--- Comment #8 from Emil Velikov <emil.l.velikov at gmail.com> ---
(In reply to comment #7)
> I'm getting similar rendering issues with a 8800 GT card in all Source
> Engine games (tested in Team Fortress 2, Counter-Strike Source and Dota 2),
> but I'm not sure if it's the same bug.
> Mine is similar to the one reported in Valve's tracker:
> https://github.com/ValveSoftware/Source-1-Games/issues/200
> There's a youtube video with show the exact same problem I am experiencing:
> https://www.youtube.com/watch?v=XLtl7VqnXoE
> 
You're experiencing exactly the same issue.

> Should I open another bug report, or is this the same problem?
> 
That should not be needed.

This issue is kind of a sore spot, as even calim (the developer who wrote the
gallium driver) is unsure why it occurs.
I'm suspecting some sort of a race/missing fence, although that's wild guess.
Note that nvc0+ cards seems to render fine with this commit - so either there
is some subtle difference between the nv50/c0 codebase or hardware.

Any input(comments, ideas, patches) would be appreciated :)

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