[PlanetCCRMA] one more request (again)

Fernando Pablo Lopez-Lezcano nando@ccrma.Stanford.EDU
Mon Feb 17 10:23:01 2003

> why does "jackd -d alsa -d hw" work
> and "jackd -d alsa -d hw:0" work
> but "jackd -d alsa -d hw:0,0" give me ->
> loading driver ..
> creating alsa driver ... hw:0,0|1024|2|48000|swmon
> ALSA lib conf.c:3816:(parse_args) Unknown parameter 1
> ALSA lib conf.c:3938:(snd_config_expand) Parse
> arguments error: No such file or directory
> ALSA lib control.c:612:(snd_ctl_open_noupdate) Invalid
> CTL hw:0,0
> control open "hw:0,0" (No such file or directory)
> cannot load driver module alsa
> jack main caught signal 15

"hw" points to the default card ("0")
"hw:0" makes that explicit
"hw:0,0" points to the first device of the soundcard

Jack uses the alsa ctl interface (in addition to the pcm interface), of
which there is only one instance per card, you can't point to "0,0", it
just does not exist. 

This should not be a problem unless you want to use a device other than
the first in the card. 

-- Fernando