I believe this may be related to bug 578673 (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/578673).
I have very similar problems. Ended up downgrading to the VESA driver, but now I do not have external monitor support.
I believe this may be related to bug 578673 (https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/578673).
I have very similar problems. Ended up downgrading to the VESA driver, but now I do not have external monitor support.