It doesn't work for me as well on a dell xps 13 sputnik
$ uname -a Linux XPS-L322X 3.8.0-23-generic #34-Ubuntu SMP Wed May 29 20:22:58 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
It doesn't work for me as well on a dell xps 13 sputnik
$ uname -a
Linux XPS-L322X 3.8.0-23-generic #34-Ubuntu SMP Wed May 29 20:22:58 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux