[Nouveau] [Bug 20341] [NV31] lockup when using AGP. agpmode=0 fixes it.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=20341

--- Comment #20 from Jason Detring <detringj at gmail.com> ---
Created attachment 84577
  --> https://bugs.freedesktop.org/attachment.cgi?id=84577&action=edit
x11perf corruption at lockup

Also related--if it helps anybody.  When vram_pushbuf and agpmode are unset
lockups will typically (but not always) show vertical banding on the part of
the screen x11perf was updating.  It looks like the black lines are pulled
apart into red and blue components.  

I'm not sure if x11perf is intended to work this way (drawing color components
seperately and converging to black), but it seems to be a common symptom that
shows up when things stop moving.

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