Who knows how to perform a DEBUG build using Scons? Scons is the only way i can successfully build blender.
Either set it in your config file (all sorts of debuggy goodness in there!) or do
on the command line.
Thanks to stiv's hint about GPU_state_init(), the problem was somehow fixed by experimenting with different drivers. Only the latest radeon drivers from http://ppa.launchpad.net/xorg-edgers/ppa/ubuntu
made blender work on my radeon7500.