[linux-audio-user] Problem with Jack

[Matteo Giaccone]

Hello,
It's more than a week that I'm trying to get off my problem without
success, so I ask you for help!
I would like to use Jack with alsa on my Ubuntu Hoary 5.04 for AMD64.
I downloaded all the alsa and jack packages needed but now I'm stuck,
I can't manage to use xmms or ardour with jack.

When i launch "jackd -v -R -d alsa -d hw:0 -r 44100 -H -z s" the output is:
getting driver descriptor from /usr/lib/libjack0.80.0-0/jack_alsa.so
getting driver descriptor from /usr/lib/libjack0.80.0-0/jack_dummy.so
getting driver descriptor from /usr/lib/libjack0.80.0-0/jack_oss.so
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

registered builtin port type 32 bit float mono audio
loading driver ..
new client: alsa_pcm, id = 1 type 1 @ 0x51d490 fd = -1
apparent rate = 44100
creating alsa driver ... hw:0|hw:0|1024|2|44100|0|0|hwmon|swmeter|-|32bit
control device hw:0
configuring for 44100Hz, period = 1024 frames, buffer = 2 periods
Couldn't open hw:0 for 32bit samples trying 24bit instead
Couldn't open hw:0 for 24bit samples trying 16bit instead
Couldn't open hw:0 for 32bit samples trying 24bit instead
Couldn't open hw:0 for 24bit samples trying 16bit instead
sample rate in use (48000 Hz) does not match requested rate (44100 Hz)
Noise-shaped dithering at 16 bits
new buffer size 1024
registered port alsa_pcm:capture_1, offset = 4096
registered port alsa_pcm:capture_2, offset = 8192
registered port alsa_pcm:playback_1, offset = 0
registered port alsa_pcm:playback_2, offset = 0
++ jack_rechain_graph():
client alsa_pcm: internal client, execution_order=0.
-- jack_rechain_graph()
23755 waiting for signals
load = 0.0375 max usecs: 16.000, spare = 21317.000


**** alsa_pcm: xrun of at least 0.022 msecs



**** alsa_pcm: xrun of at least 0.021 msecs



**** alsa_pcm: xrun of at least 0.032 msecs



**** alsa_pcm: xrun of at least 0.018 msecs

and this message goes on until i stop jackd. Then I receive this:

jack main caught signal 2
stopping driver


**** alsa_pcm: xrun of at least 0.023 msecs

detaching driver
unloading driver
freeing shared port segments
stopping server thread
stopping watchdog thread
freeing engine shared memory
max usecs: 16.000, engine deleted

with qjackctl is exactly the same.

If I try to use XMMS I receive the error as my soundcard is not
configured and if i run ardour i hear the sounds but very fragmented
as if my pc couldn't play the files. With alsa everything goes well, i
can use xmms and other sounds... Could you help me? Thanks a lot.

Matteo Giaccone