Comment 10 for bug 446632

I can confirm that downgrading helps.

I installed the following packages from the very first karmic versions of mesa, skipping the binaries from the mesa packages that were not already installed on my system:

libgl1-mesa-dri_7.4-0ubuntu3_i386.deb
libgl1-mesa-glx_7.4-0ubuntu3_i386.deb
libgl1-mesa-glx-dbg_7.4-0ubuntu3_i386.deb
libglu1-mesa_7.4-0ubuntu3_i386.deb
mesa-utils_7.4-0ubuntu3_i386.deb

I now have a very nice pattern if the notifier pops up, and the window decoration looks a bit strange, too. Redrawing of damaged areas is also a bit slow. But Blender does not crash!

The next task would be to find the version that makes Blender crash.