[PlanetCCRMA] Jack trouble

Fernando Pablo Lopez-Lezcano nando@ccrma.Stanford.EDU
Mon Nov 8 10:35:03 2004

On Sat, 2004-11-06 at 13:31, Devin Venable wrote:
> I'm trying to get rosegarden running on Fedora Core 1.  I got the
> packaged RPMs, installed them, and everything went fine after I started
> explicitly loading the sequencer alsa kernel module as mentioned in this
> post:
> http://ccrma-mail.stanford.edu/pipermail/planetccrma/2003-May/001796.html
> Rosegarden loads but I can't detect any midi signals being sent to my
> sound card. (Rosegarden reports "No Connection" for general MIDI device
> 1)
> I changed the settings to launch JACK at startup, but received an
> error.  When trying to start JACK at the command line, I'm seeing this:
> /usr/bin/jackd -d alsa -d hw -r 44100 -p 2048 -n 2
> jackd 0.99.0
> Copyright 2001-2003 Paul Davis and others.
> jackd comes with ABSOLUTELY NO WARRANTY
> This is free software, and you are welcome to redistribute it
> under certain conditions; see the file COPYING for details
> loading driver ..
> apparent rate = 44100
> creating alsa driver ... hw|hw|2048|2|44100|0|0|nomon|swmeter|-|32bit
> ALSA: Cannot open PCM device alsa_pcm for playback. Falling back to
> capture-only mode
> cannot load driver module alsa

Try with different sized buffers (I'd try smaller sizes). For some
reason your soundcard does not like the parameters you are giving jack
for the playback direction (apparently they are fine for the recording

Hmmm, _or_ something is using the pcm output, check for running desktop
sound services like arts or esd...

-- Fernando