Could you have a look to see if one of these bug match yours https://bugs.launchpad.net/ubuntu/+source/casper/+bug/217907 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/543875 If yes, link your bug to this one and subscribe to give more weight to bug.
Could you have a look to see if one of these bug match yours /bugs.launchpad .net/ubuntu/ +source/ casper/ +bug/217907 /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/543875
https:/
https:/
If yes, link your bug to this one and subscribe to give more weight to bug.