[Nouveau] [Bug 20023] nv20: unwanted solid fills during busyloop rendering

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=20023





--- Comment #1 from Pekka Paalanen <pq at iki.fi>  2009-02-09 12:51:52 PST ---
Hypothesis: Gallium hw ctx and EXA hw ctx are leaking state, incomplete context
switching.

Test: disable all EXA acceleration.

NV04EXAPrepareSolid(), NV04EXAPrepareCopy(), NV10EXACheckComposite() were
modified to return FALSE immediately. Additionally UTS and DFS were disabled
via xorg.conf.

Result: no impact. The SCF appears as before.

Even though EXA should not be using hw acceleration, the DRM and EXA hw ctxs
still exist. However, it is unlikely for the SCF to be caused by state leaking
from a context to another.


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