[linux-audio-dev] dmix and jack

Lee Revell rlrevell at joe-job.com
Mon Jan 30 15:10:17 EST 2006

On Mon, 2006-01-30 at 20:05 +0000, James Courtier-Dutton wrote:
> voidcreature at paradise.net.nz wrote:
> > Has anyone managed to successfully get jackd talking to dmix?
> > 
> > My dmix setup works fix (i run VoIP stuff, artsd, and other assorted junk 
> > through it daily).
> > 
> > jackd works great when connect to hw:0,0 or to plughw:0,0 (with the warning), 
> > but if I point it at my dmix'd "default"  it sits there with 100% CPU usage, 
> > and doesn't otherwise operate.
> > 
> > Does anyone have this combination of jack and dmix working?
> > 
> It is due to the fact that the alsa programming in jackd has been 
> implemented wrongly. The poll revents are not handled correctly.
> This results is OK operation when using hw:0,0, but likely to fail for 
> more exotic alsa configurations like dmix.

Does this also explain why JACK does not work with the ALSA PCM multi
plugin, unless ALSA is patched?


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