[ubuntu] no sound, sometimes?

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http://ubuntuforums.org – Hello, completely new to Ubuntu and Linux and I'm having issues with my sound. I've done everything detailed here: http://www.unixmen.com/2012003-howto...lem-on-ubuntu/ I've installed the codecs package. I've installed pulse audio controls. And yes, I've made sure it's not muted anywhere. But, sound -does- work -sometimes-. Logging in/logging out plays a sound, the sounds available in the sound settings play. The issue is mainly with Empathy. No sound at all. I downloaded Pidgin sounds, thinking the Empathy sounds were just too soft or something, but even those make no sound, b (Hardware)