Running Debian Sid, 3.1 Kernel (Alsa is problematic in 3.2!).
The target audio device hw:1 is a usb-audio Lambda interface.
This is what I get:
Mon Feb 20 19:24:43 2012: Starting jack server...
Mon Feb 20 19:24:43 2012: JACK server starting in realtime mode with priority
10
Cannot connect to server socket err = No such file or directory
Cannot connect to server socket
jack server is not running or cannot be started
Mon Feb 20 19:24:43 2012: control device hw:1
Mon Feb 20 19:24:43 2012: control device hw:1
Mon Feb 20 19:24:43 2012: [1m[31mERROR: Failed to acquire device name :
Audio1 error : Cannot allocate memory[0m
Mon Feb 20 19:24:43 2012: [1m[31mERROR: Audio device hw:1 cannot be
acquired...[0m
Mon Feb 20 19:24:43 2012: [1m[31mERROR: Cannot initialize driver[0m
Mon Feb 20 19:24:43 2012: [1m[31mERROR: JackServer::Open() failed with
-1[0m
Mon Feb 20 19:24:43 2012: [1m[31mERROR: Failed to open server[0m
Mon Feb 20 19:24:44 2012: Saving settings to
"/home/david/.config/jack/conf.xml" ...
19:24:46.011 Could not connect to JACK server as client. - Overall operation
failed. - Unable to connect to server. Please check the messages window for
more info.
Cannot connect to server socket err = No such file or directory
Cannot connect to server socket
jack server is not running or cannot be started
This is the XML file menstion above:
<?xml version="1.0"?>
<!--
JACK settings, as persisted by D-Bus object.
You probably don't want to edit this because
it will be overwritten next time jackdbus saves.
-->
<!-- Mon Feb 20 19:31:42 2012 -->
<jack>
<engine>
<option name="driver">alsa</option>
<option name="realtime">true</option>
<option name="verbose">false</option>
<option name="client-timeout">500</option>
</engine>
<drivers>
<driver name="alsa">
<option name="capture">hw:1</option>
<option name="playback">hw:1</option>
<option name="device">hw:1</option>
<option name="rate">48000</option>
<option name="period">1024</option>
<option name="nperiods">3</option>
<option name="hwmon">false</option>
<option name="hwmeter">false</option>
<option name="duplex">true</option>
<option name="softmode">false</option>
<option name="monitor">true</option>
<option name="dither">n</option>
<option name="shorts">true</option>
<option name="midi-driver">seq</option>
</driver>
<driver name="netone">
</driver>
<driver name="net">
</driver>
<driver name="loopback">
</driver>
<driver name="dummy">
</driver>
</drivers>
<internals>
<internal name="netmanager">
</internal>
<internal name="audioadapter">
</internal>
<internal name="netadapter">
</internal>
<internal name="profiler">
</internal>
</internals>
</jack>
Nothing very illuminating.