I have a very strong suspicion that bugs #407036, #410768, #405823, and #402563 might all be the same bug as #406044
Bug reporters: Please try this patch: http://bugs.debian.org/cgi-bin/bugreport.cgi/xorg-server.nocrash.patch?bug=406044;msg=45;att=1And report if it fixes the problem. (It fixed it for me, but I'm not the original reporter of 406044 so the two other reporters in 406044 please also try the patch.)
-Ariel