This issue seems to be the same as https://bugs.launchpad.net/ubuntu/+source/linux/+bug/621265 I've marked this one as duplicate. Under the #621265 progress is being made in narrowing down the problem.
This issue seems to be the same as https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/621265
I've marked this one as duplicate. Under the #621265 progress is being made in narrowing down the problem.