Per comment #63, this bug does not exist in v3.9 final. We now also know v3.10 final has the bug. That would indicate this bug was introduced in one of the v3.9 release candidates.
In comment #58 you mentined that you tested v3.9-rc1, but were unable to test due to issues with the desktop, so we should try some other release candidates. Can you test v3.9-rc4:
Per comment #63, this bug does not exist in v3.9 final. We now also know v3.10 final has the bug. That would indicate this bug was introduced in one of the v3.9 release candidates.
In comment #58 you mentined that you tested v3.9-rc1, but were unable to test due to issues with the desktop, so we should try some other release candidates. Can you test v3.9-rc4:
http:// kernel. ubuntu. com/~kernel- ppa/mainline/ v3.9-rc4- raring/