I have the same problems, my system is a Lenovo ThinkCentre M55 with a on-board Intel graphics adapter "Q965/Q963 Express Chipset Family". I think the bug https://bugs.launchpad.net/ubuntu/+source/linux/+bug/404421 is related.
I have the same problems, my system is a Lenovo ThinkCentre M55 with a on-board Intel graphics adapter "Q965/Q963 Express Chipset Family". I think the bug https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/404421 is related.