Start with /var/log/Xorg.0.log after the hang but before rebooting (try switching to a virtual terminal, or remotely logging in). That should mention a GPU hang, and so /sys/kernel/debug/dri/0/i915_error_state is the key bit of information for post-mortem debugging.
-- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/1164761 Title: Unity interface freezes very often (i915 video driver) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1164761/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
