The working theory we have at the moment is that this bug is being
caused by the patch 103_bump_965_texture_limit.diff.  This patch
increases the texture size for i965 cards.  This patch was proposed for
mesa 7.4 but declined with the following comment:

"Each time we bump up the max texture size it means we also increase the
max drawing surface size (render to texture and all that).  One
consequence of this is the fixed point arithmetic in the swrast triangle
code may start failing.  There's comments in the code about it.  It also
means various internal buffers will double in size.

It's not a huge deal, but some testing needs to be done.  I really need
to write a glean test that exercises max-sized textures/FBOs..."

Based on upstream's review that this could cause instabilities, I
consider it our leading suspect at this time.

I've prepared a PPA with this change reverted.  I've installed it and
been running it on my test box without problems for a couple hours.  Can
others please give this a try and see if it helps?

https://edge.launchpad.net/~bryceharrington/+archive/purple

-- 
[i965] X freezes starting on April 3rd
https://bugs.launchpad.net/bugs/359392
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