[ubuntu] No sound on Dell XPS 420

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http://ubuntuforums.org – Hi there everyone, I've got a brand new install of ubu on a Dell XPS 420. Dell lists my audio device as: Quote: Card, Multi-Meldia, Audio Creative Sound Blaster X-FI Windows Vista Os I'm dualbooting with Vista in which the sound works. When I boot into Ubu, no ports generate sound during testing and only a single channel is available to me under volume control and the output device is listed as Null Output (PulseAudio Mixer), which leads me to believe that it's not recognizing my audio output device. The device dropdown does not offer another choice. Could someone help me figure out how to get it working? thanks, json (Hardware)