https://bugs.freedesktop.org/show_bug.cgi?id=36812
--- Comment #3 from Sven Arvidsson sa@whiz.se 2011-05-16 12:47:38 PDT --- I'm having the same problem with Left 4 Dead on:
System environment: -- system architecture: 32-bit -- Linux distribution: Debian unstable -- GPU: REDWOOD -- Model: XFX Radeon HD 5670 1GB -- Display connector: DVI -- xf86-video-ati: 6.14.1 -- xserver: 1.10.1 -- mesa: git-51095f7 -- drm: 2.4.25 -- kernel: 2.6.39-rc7
Reverting the commit mentioned above works.
The apitrace uploaded here might be useful to reproduce the hang: http://dl.dropbox.com/u/28577999/l4d.trace.7z