[Nouveau] [Bug 61460] With Option "NoAccel" "0", xorg fails...

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=61460

--- Comment #4 from Ilia Mirkin <imirkin at alum.mit.edu> ---
It's not particularly clear (to me) where the bug is. Certainly there appears
to be an issue in the xf86-video-nouveau EXA implementation when the card dies,
it starts dereferencing NULL-ish pointers. However I think that the card dying
is the primary issue...

The bug here starts out with

[    6.760320] nouveau E[     DRM] GPU lockup - switching to software fbcon

before anything really happens, and then X starts, and PGRAPH is variously
freaking out. The nouveau GPU reset logic isn't so great... my experience is
that oftentimes only a reboot really fixes a GPU lockup. (Sometimes it's fine
though.)

In the altlinux.org bug there's also a GPU lockup detected, and it's not likely
to be due to the fact that X died, but rather the other way around. (Lockups
aren't necessarily detected immediately...)

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