Comment # 11 on bug 91790 from Mathias Tillman

(In reply to Alex Deucher from comment #10)
> Created attachment 118056 [details] [review] [review]
> possible fix
> 
> I think this patch should fix it.

No luck here I'm afraid - I'm having a hard time reproducing it during normal
desktop usage (with or without the patch), but it did lockup while running
Unigine Valley.