[LAU] Jack gives xruns with alsa driver, but dummy driver + alsa_in/out doesn't

Hi All,

I'm having a very strange problem setting up Jack.

I have a card which aplay -l lists as

card 0: SB [HDA ATI SB], device 0: ALC892 Analog [ALC892 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: SB [HDA ATI SB], device 1: ALC892 Digital [ALC892 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

I'm only interested in the analog outputs.

when I start up jackd (from qjackctrl), I am offered three different options
for my sound interface:

hw:0 HDA ATI SB
hw:0,0 ALC892 Analog
hw:0,1 ALC892 Digital

(input devices are similar)

However, when I start up jackd, I get a constant stream of xruns. This is
true regardless of what combination of input and output hardware device I
choose, as well as real-time settings and period size (I obviously haven't
tested everything, but a large representative swath).

On the other hand, if I choose plughw:0, jackd gives me a warning, but I can
get zero xruns and no artifacts for as low as 128 frames/period.

Similarly, if I start jack with the dummy driver, and then run alsa_in, I
can get down to 32 frames/period with no artifacts nor xruns.

What could be going on?

Thanks,
Jeremy

_______________________________________________
Linux-audio-user mailing list
Linux-audio-user@email-addr-hidden
http://lists.linuxaudio.org/listinfo/linux-audio-user
Received on Fri Apr 22 00:15:01 2011