For those creative sound cards (e.g. emu10k1, ca0106) which use multi plugin for surround playback It seem that set start_threshold to -1 has no effect on some devices (e.g. multi plugin) , the device seem automatically started and pulseaudio does not check pcm state when calling snd_pcm_start (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_START failed (-77) Does it mean bug of multi plugin or start_threshold.have no effect on some devices/plugin ? ( 0.106| 0.000) I: [alsa-sink-emu10k1] alsa-sink.c: Starting playback. ( 0.106| 0.000) I: [alsa-sink-emu10k1] (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_START failed (-77) Possible fix is check pcm state before calling snd_pcm_start and only warn about sink is already running -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20141126/6b92be15/attachment.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: pcm_start.patch Type: text/x-patch Size: 862 bytes Desc: not available URL: <http://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20141126/6b92be15/attachment.bin>