Comment 172 for bug 359392

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...