[linux-audio-user] Non-xrun noise with ALSA, Jack and an USB soundcard

Jorma R rjorma at jippii.fi
Wed Apr 14 23:40:08 EDT 2004


Thanks for the replies, all.

I get the noise regardless of whether I run Jack from the console or 
qjackctl so that is not the cause.

> Can you record the noise? I was expierincing a similar thing
> a few weeks ago and discovered it to be caused by my netowrk
> card under heavy traffic.
> --ant

I could basically record the noise to an external recorder. As said - 
the captured audio is always clean. This noise comes in in between the 
capture and playback. In other words it is either Jack, Alsa or the 

Is there a way I coud get Jack to run without -S and with a -p greater 
than 1024 with 6 input channels? Error message below.


[jorma at turpea jorma]$ jackstart -v -R -dalsa -dhw:0 -r44100 -p2048 -n2
back from read, ret = 1 errno == Success
getting driver descriptor from /usr/lib/jack/jack_alsa.so
getting driver descriptor from /usr/lib/jack/jack_dummy.so
jackd 0.94.0
Copyright 2001-2003 Paul Davis and others.
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
capabilities: =i cap_setpcap,cap_ipc_lock,cap_sys_nice,cap_sys_resource+ep
loading driver ..
new client: alsa_pcm, id = 1 type 1 @ 0x8058b40 fd = -1
apparent rate = 44100
creating alsa driver ... hw:0|hw:0|2048|2|44100|0|0|nomon|swmeter|rt|32bit
control device hw:0
configuring for 44100Hz, period = 2048 frames, buffer = 2 periods
Couldn't open hw:0 for 32bit samples trying 24bit instead
ALSA: cannot set period size to 2048 frames for capture
ALSA: cannot configure capture channel
cannot load driver module alsa

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