[Bug 94900] HD6950 GPU lockup loop with various steam games (octodad, saints row 4, grid autosport)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94900

--- Comment #10 from Adam Lyall <magicmyth at magicmyth.com> ---
Hi, I've been get this issue with my Radeon HD5850 as well. Grid Autosport
always crashes at the same place in its benchmark (just before the big hill)
but I found if I disable the SB Shader optimizer (R600_DEBUG=nosb) the game
runs perfectly throughout.

My GPU temperature is fine (tops out at 62c on a hot day) so that does not seem
to be an issue.

I've dumped the shaders for both when the game crashes with SB and when it is
running fine with nosb in hopes they might help (I've followed what Jürgen
Scholz did at issue 93352#c7). I won't be near this computer for a few weeks
now but if you let me know if there is more info you would like me to gather in
the next 24 hours I'll see what I can do.

FYI my system is:
Ubuntu 16.04
Mesa from padoka PPA (12.1~git160603151200.a64c7cd~x~padoka0)
SAPPHIRE VAPOR-X Radeon HD 5870
AMD Phenom II 955

For now I'm just attaching the shader dump from the crashed SB version. If you
want them I'll upload the nosb variant as well? I've also attached the script I
made for debugging the game.

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