"Everything is looking without theme" sounds like a window manager crash. I *think* all the symptoms you describe correspond to a WM crash, although blank screens with moving mouse issues can also sometimes be GPU lockups.
For GPU lockup bugs with Intel graphics, you need to collect the output of 'dmesg' and your /sys/kernel/debug/dri/0/i915_error_state file. Both of these must be collected while the machine is locked up (e.g. by sshing into the sick machine over ethernet). See https://wiki.ubuntu.com/X/Troubleshooting/Freeze for additional info. ** Package changed: xserver-xorg-video-intel (Ubuntu) => metacity (Ubuntu) ** Changed in: metacity (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/768378 Title: Change in resolution failed. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
