I: core-util.c: Successfully enabled SCHED_RR scheduling for thread, with priority 5. I: alsa-sink.c: Starting playback. I: (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_START failed (-77) I: (alsa-lib)pcm_hw.c: PCM state = RUNNING

any limitation to use -1 as start_thershold ?

why SNDRV_PCM_IOCTL_START failed (-77) only occur with PA server when using "multi" plugin of surround40 of ca0106 ? other application (e.g. aplay , speaker-test and mplayer seem work fine

https://bugtrack.alsa-project.org/alsa-bug/view.php?id=5018