Dell Studio xps ,has a problem with sound in Ubuntu.
Actually machine detects the sound card properly
but cannot hear the sound.So you have to manually
edit the following file
Go to your Terminal and type:
$sudo gedit /etc/modprobe.d/alsa-base.conf
Then add following line at the end of the file
options snd-hda-intel model = dell-m6
Then reboot the system
When next Login you will hear the Ubuntu Login sound
Thank you
Jasintha