Have a look at:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/393455
Apple hardware, pci 27a2 bus ID, similar symptoms.
May be related; there's a patch linked at the end to see if it fixes things.
Have a look at:
https:/ /bugs.launchpad .net/ubuntu/ +source/ xserver- xorg-video- intel/+ bug/393455
Apple hardware, pci 27a2 bus ID, similar symptoms.
May be related; there's a patch linked at the end to see if it fixes things.