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Sound fades slowly during playback

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http://forums.fedoraforum.org – Hello: I have recently installed a fresh copy of Fedora 12. I noticed right away that audio playback works at first, but the volume fades to silence over the span of 15-20 seconds or so. Killing pulseaudio causes volume to be restored, but the problem repeats itself as soon as any new audio output is generated (mplayer, flash, even system sounds like volume up/down sound effects.) During playback, pavumeter does not show any decrease in output volume on either the front-left or front-right channel. Running pulseaudio with -vvvvv only shows the following interesting output (not sure if I'm a good judge of what's interesting so please let me know if I should post full logs.): I: protocol-native.c: Final latency 460.00 ms = 210.00 ms + 2*20.00 ms + 210.00 ms D: alsa-sink.c: Requested volume: 0: 100% 1: 100% D: alsa-sink.c: Got hardware volume: 0: 100% 1: 100% D: alsa-sink.c: Calculated software volume: 0: 100% 1: 100% (accurate-enough=yes) D: alsa-sink.c: Cutting sleep time for the initial iterations by half. D: alsa-sink.c: Latency set to 210.00ms D: alsa-sink.c: hwbuf_unused=315724 D: alsa-sink.c: setting avail_min=87311 D: alsa-sink.c: Requesting rewind due to latency change. D: alsa-sink.c: Requested to rewind 352768 bytes. D: alsa-sink.c: Limited to 348876 bytes. D: alsa-sink.c: before: 87219 D: alsa-sink.c: after: 87219 D: alsa-sink.c: Rewound 348876 bytes. D: sink.c: Processing rewind... D: sink-input.c: Have to rewind 348876 bytes on render memblockq. D: source.c: Processing rewind... D: core-subscribe.c: Dropped redundant event due to change event. D: reserve-wrap.c: Device lock status of reserve-monitor-wrapper@Audio0 changed: not busy D: protocol-native.c: Requesting rewind due to end of underrun. D: alsa-sink.c: Requested to rewind 352768 bytes. D: alsa-sink.c: Limited to 30688 bytes. D: alsa-sink.c: before: 7672 D: alsa-sink.c: after: 7672 D: alsa-sink.c: Rewound 30688 bytes. D: sink.c: Processing rewind... D: sink-input.c: Have to rewind 30688 bytes on render memblockq. D: source.c: Processing rewind... D: protocol-native.c: Underrun on 'audio stream', 0 bytes in queue. D: protocol-native.c: Requesting rewind due to end of underrun. D: alsa-sink.c: Requested to rewind 18504 bytes. D: alsa-sink.c: Limited to 18504 bytes. D: alsa-sink.c: before: 4626 D: alsa-sink.c: after: 4626 D: alsa-sink.c: Rewound 18504 bytes. D: sink.c: Processing rewind... D: sink-input.c: Have to rewind 18504 bytes on render memblockq. D: source.c: Processing rewind... This last message is what sits on the screen as the volume fades away. Some more detail (not sure if pulseaudio is even the problem, but seems like a reasonable place to start): pulseaudio-module-x11-0.9.21-1.fc12.x86_64 pulseaudio-libs-0.9.21-1.fc12.x86_64 alsa-plugins-pulseaudio-1.0.21-2.fc12.x86_64 pulseaudio-module-bluetooth-0.9.21-1.fc12.x86_64 pulseaudio-gdm-hooks-0.9.21-1.fc12.x86_64 pulseaudio-module-gconf-0.9.21-1.fc12.x86_64 pulseaudio-libs-glib2-0.9.21-1.fc12.x86_64 pulseaudio-0.9.21-1.fc12.x86_64 pulseaudio-utils-0.9.21-1.fc12.x86_64 kernel is 2.6.31.6-145.fc12.x86_64 sound chip is nVidia Corporation MCP51 High Definition Audio (rev a2) Thank you in advance if you've just read through all the junk above, even if you can't think of anything to add to the thread :) (HowTos)