I don't think it's overheating. Me too I have an ATI Mobility 7500 on a Compaw N800v. Same behaviour, with CPUT temperature of 50°C and 71° C. In addition, the freeze seems to occur when my pcmcia madwifi card loses connection.
-- [dapper] xrandr freezes the system (radeon, MergedFB) https://launchpad.net/bugs/47775 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
