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0e1f616
(Get the code!)
Some more information: upgrading ALSA to 1.0.20 and Pulse to 0.9.15 didn't help with this issue. The only thing that seemed to make a difference were the "PCI latency" settings in my BIOS: higher values seemed to make the issue appear at a higher frequency; lower values seemed to improve - but not fix - the situation. (I tried 1, 2, 4, 8, 16, 32, 64, 128, 255, default is 32).
My final solution was to pop in an old SBLive! 5.1 card I happened to have lying around. This fixed the dropout issue completely (but caused different problems which cause Pulse to die completely every few minutes).
I don't think this issue is connected to the specific TV (I have a Sony W4000), as I have confirmed HDMI audio to work correctly with different hardware/software combinations.