Loud POPPING sound

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http://www.linuxquestions.org – There's a popping sound when im on battery power. This has never happened it's concievably possible i have upgraded since the last time ive used the battery.. Restarting ALSA seems to fix it, but if i logout/in it's fucked again. The sound pops when initiating audio. For instance when starting a movie. Though sometimes it pops randomly. (HowTos)