[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 #13 from eydee <amd1800plussz at gmail.com> ---
Adding some info, I have very similar GPU crashes (including kernel log) on
6850 BARTS using any recent (11.x, 12.x) Mesa version up until latest git.

The GPU lockup and crash happens in Bioshock Infinite, right after the intro
logos and before reaching the title screen. It is not random, there's no way to
start the game at all without touching Mesa configuration. However, launching
with R600_DEBUG=nosb makes the game start up perfectly. Everything works, no
visual glitches either, only performance is lower than expected, possibly
because of the lack of shader optimization.

I can do an apitrace if needed, but can't replay and analyze it, as apitrace
can't replay on forced OpenGL context. (BARTS only exposes 3.3, overriding is
required to start the game.)

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