I've tested with the latest upstream kernel.
test@test-Dell-System-XPS-L322X:~$ uname -a Linux test-Dell-System-XPS-L322X 3.9.0-030900rc4-generic #201303232035 SMP Sun Mar 24 00:36:21 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
I've tested with the latest upstream kernel.
test@test- Dell-System- XPS-L322X: ~$ uname -a System- XPS-L322X 3.9.0-030900rc4 -generic #201303232035 SMP Sun Mar 24 00:36:21 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
Linux test-Dell-