Confirming that updating to a 3.16 kernel does not resolve the issue:
$ uname -a Linux arya 3.16.0-38-generic #52~14.04.1-Ubuntu SMP Fri May 8 09:43:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Confirming that updating to a 3.16 kernel does not resolve the issue:
$ uname -a
Linux arya 3.16.0-38-generic #52~14.04.1-Ubuntu SMP Fri May 8 09:43:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux