> Hmm, I expected the stereo playback to only go to the first two > channels. Let me try this later. I re-check it but it reappears. > No, if only "10 channels" is supported, then when trying "8 channels" > and "12 channels" (and so on), it should not come as far as to starting > and stopping streams - the driver should return earlier with some error, > because the channel count does not match with the hw params constraint. Oops. Yes, you're correct. Thank for your indication. But then, I mind line 381 in /src/modules/alsa/alsa-util.c. http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/alsa-util.c#n381 if ((ret = snd_pcm_prepare(pcm_handle)) < 0) { pa_log_info("snd_pcm_prepare() failed: %s", pa_alsa_strerror(ret)); goto finish; } When snd_pcm_hw_params() is success, process reaches this line. Then snd_pcm_prepare() is already executed by snd_pcm_hw_params(). So we can remove this line. I think that snd_pcm_prepare() should be called when recovering from any XRUNs or suspend. Regards Takashi Sakamoto
