[ardour-users] subgraph starting at ardour timed out

[Jesse Chappell]

Ivan Z. Ganza wrote on Tue, 02-Mar-2004:

 > Start jack, start ardour.  Open up previous session, hit play.  Sound 
 > plays, sounds great!  As soon as I stop this soon afterward I get the 
 > subgraph error.  It seems to only happen soon after I STOP interacting 
 > with ardour though.  I'm forced to restart ardour after this error.
 > 
 > any suggestions?  There is more then enough CPU power on this box.  This 
 > CPU is HT and I'm running under an SMP aware kernel, is this bad?

Hard to say why you get the subgraph error.  However, you really
should be running JACK with the realtime flag (-R), since you
use 2.6, Jack O'Quin's realtime security module will allow you
to use the realtime flag as a normal user.   http://www.joq.us/
Otherwise, to get realtime privileges you would need to run JACK
and all jack apps as root.  

I recommend trying out realtime, to see if these problems recur.

jlc


 > Ardour built last night:
 >     http://ardour.org/releases/ardour-0.9beta11.2.tar.bz2
 > 
 > Output from Jack:
 > 
 > jackd 0.94.0
 > 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 = 48000
 > creating alsa driver ... 
 > hw:0|hw:0|512|2|48000|0|0|nomon|swmeter|soft-mode|32bit
 > control device hw:0
 > configuring for 48000Hz, period = 512 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
 > Noise-shaped dithering at 16 bits