This also appears in the logs at least once: D: [alsa-sink-] protocol-native.c: Requesting rewind due to end of underrun. D: [alsa-sink-] protocol-native.c: Requesting rewind due to end of underrun. D: [alsa-sink-] protocol-native.c: Requesting rewind due to end of underrun. D: [alsa-sink-] sink-input.c: Requesting rewind due to uncorking D: [alsa-sink-] alsa-sink.c: Requested to rewind 0 bytes. D: [pulseaudio] module-suspend-on-idle.c: Sink alsa_output.pci-0000_00_1b.0.iec958-ac3-surround-51 becomes busy, resuming. D: [alsa-sink-] alsa-sink.c: Mhmm, actually there is nothing to rewind. E: [alsa-sink-] alsa-sink.c: ALSA woke us up to write new data to the device, but there was actually nothing to write! E: [alsa-sink-] alsa-sink.c: Most likely this is a bug in the ALSA driver '(null)'. Please report this issue to the ALSA developers. E: [alsa-sink-] alsa-sink.c: We were woken up with POLLOUT set -- however a subsequent snd_pcm_avail() returned 0 or another value < min_avail.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to pulseaudio in Ubuntu. https://bugs.launchpad.net/bugs/1188425 Title: Audio breaks up and pulseaudio eventually crashes with Alsa a52 (ac3) plugin (Ubuntu 13.04) Status in “pulseaudio” package in Ubuntu: New Bug description: I am encoding all audio in AC3 and sending it to my Logitech Z-5500 speakers through the SPDIF out jack on my laptop. Audio works fine for a while until it breaks up randomly and pulseaudio eventually crashes. By looking to the pulseaudio logs one can see some buffer underruns. I also tested with the 3.9.4 mainline kernel though I am not sure this issue is driver related. The result is always the same! I have this in /usr/share/alsa/alsa.conf.d/a52.conf pcm.a52 { @args [CARD] @args.CARD { type string } type rate slave { pcm { type a52 format S16_LE # S16_LE, S16_BE channels 6 # 2, 4, 6 bitrate 640 # 192, 224, 256, 320, 384, 448, 512, 576, 640 card $CARD } rate 48000 # 44100, 48000 } } One other thing I tried was the dcaenc-2 alsa plugin from this web page http://aepatrakov.narod.ru/index/0-2 and this plugin appears to not have the same problem. The disadvantage of the dca plugin is that it needs a lot more processing power! So I would prefer the a52 plugin if it worked flawlessly. These are the answers to the first two questions: 1) Ubuntu 13.04 2) libasound2-plugins-extra: Installed: 1.0.25-2ubuntu3 Candidate: 1.0.25-2ubuntu3 Version table: *** 1.0.25-2ubuntu3 0 500 http://pt.archive.ubuntu.com/ubuntu/ raring/universe amd64 Packages 100 /var/lib/dpkg/status To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1188425/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
