Same problem in my Sony Vaio Z1RMP (ati mobility RV100 or RV200 - i don't remember). I use the open source driver "ati" in my xorg.conf file. I use the lasted kernel (2.6.15-26-686 #1 SMP PREEMPT) When i switch GTK application to an another GTK application my system freeze (3 time today, but 0 time last week). I use a laptop (today witch AC Sector) and all works properly. My system is an upgrade from debian sarge -> hoary -> breezy -> dapper.
-- dapper system freeze https://launchpad.net/bugs/50687 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs