Possibly related to the following - need to do more investigating.
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/618833
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/617455
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/614209
Possibly related to the following - need to do more investigating.
https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/618833
https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/617455
https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/614209