[Bug 105425] 3D & games produce periodic GPU crashes (Radeon R7 370)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105425

--- Comment #9 from MirceaKitsune <sonichedgehog_hyperblast00 at yahoo.com> ---
And we have a verdict. The influential factor is by far the anti-aliasing, at
least in the case of Xonotic. The other cvars I previously mentioned have
absolutely no effect on the frequency of this freeze.

Today I enabled the feature again and tried playing another match: I instantly
got two lockups, one after 8 minutes and the other after only 20 seconds! I
then disabled it and let the bots play again while I was away: This time the
machine froze after more than 2 whole hours of experiencing no issues.

I find it interesting how the probability of the freeze seems to scale with the
number of samples: If I use 4x AA ("vid_samples 4"), I get a crash roughly
every 30 minutes... if I disable AA ("vid_samples 1"), I get a crash less than
once per 2 hours... 30 minutes * 4x = 2 hours. Maybe this is just me seeing
patterns but I thought I should suggest the idea.

I'd like to hear some thoughts from the developers or experienced users at this
point. Can we close in on the source of this GPU lockup, knowing that Anti
Aliasing greatly affects its frequency in Darkplaces engine? Are there any open
bugs about AA related X11 crashes I should check out? What else can I test,
ideally still under Xonotic where I have the best test case prepared?

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