On Ubuntu 9.04 my laptop freezes about one time per day. When the freeze occurs I can't do anything except move the mouse, the display is completely frozen. Caps Lock doesn't even work.
I've managed to login to my laptop using ssh during a freeze but i can't make gdm restart. gdm tells me that it is restarted but nothing happens on the display. Sometimes I can make the computer reboot (using ssh and 'shutdown -r now') but it takes a long time before anything happens. I mostly need to do a hard reboot.
My laptop seems to have this bug (i915GM mtrr bug) so I've followed this guide using the Optimal solution. I don't know if this has something to do whith the freeze?
I've attached a batchbuffer dump made during the last freeze. I got the dump using this guide.
Linux baerbar 2.6.30-02063003-generic #02063003 SMP Sat Jul 25 10:57:13 UTC 2009 i686 GNU/Linux
lspci -nn | grep VGA
00:02.0 VGA compatible controller : Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller [8086:2592] (rev 03)