I've been thinking about the tangle of package versions we've got now
and it prompted a couple of thoughts.

1. What happens when you have libgl1-mesa-glx AND lib-gl1-mesa-swx11
installed?

AIUI -glx is the hw-acceleration version of OpenGL and will therefore
trigger any DRI bugs we have and generally sweat the graphics hardware
fully, whereas -swx11 is a software rendering engine for OpenGL and
unlikely to use the full capabilities of the chipset.

Could it be we have some people here with swx11 accidentally installed
therefore putting them into software render mode, and therefore going
-around- any bugs in the hw?

I notice wirechief has ended up with both installed... glx "official"
7.4-0ubuntu3 but swx11 from Bryce's purple version.

2. What libosmesa6 do - "Mesa Off-screen rendering extension"

I don't have it installed, I guess because no other package has ever
pulled it in. If I ask to install -swx11 then I need to install this
library too... so I haven't, yet, but might be interesting to see if it
changes my symptoms.

I've gone to 7.4-0ubuntu3 and I CAN now boot with EXA + greedy under
2.6.30RC2 - I had a freeze straightaway in X with 7.4.0ubuntu2. So
something's fixed in EXA mode at least...

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