[LAU] emi 2 | 6: after upgrade from ubuntustudio 7.04-7.10, alsa works, but no jack

drew Roberts zotz at 100jamz.com
Sun Dec 2 08:33:11 EST 2007

On Saturday 01 December 2007 21:38:54 howard peacock wrote:
> Hi everyone - thanks for being there.  From what I've read, this seems like
> a very knowledgeable thread, so I hope someone can help with this...
> I upgraded from ubuntu studio Feisty to studio Gutsy recently, and although
> everything sound-wise is working fine (i.e. all system sounds and non-jack
> dependent audio programs are working fine), I can't get jack to work with
> my sound card.
> The sound card is an EMI 2| 6 (usb) - alsa picks it up, and I can select
> 'alsa' as my system sound device with no problems.

Are you sure jack is trying to use the USB card? my USB cards have never been 
> starting jackd -d alsa gives this:
> loading driver ..
> apparent rate = 48000
> creating alsa driver ...
> hw:0,0|hw:0,0|1024|16|48000|0|0|nomon|swmeter|-|32bit control device hw:0
> configuring for 48000Hz, period = 1024 frames, buffer = 16 periods
> ALSA: final selected sample format for capture: 24bit little-endian
> ALSA: use 16 periods for capture
> ALSA: final selected sample format for playback: 24bit little-endian
> ALSA: use 16 periods for playback
> ALSA: cannot set hardware parameters for playback
> ALSA: cannot configure playback channel
> cannot load driver module alsa
> no message buffer overruns
> 01:44:32.686 JACK was stopped successfully.
> 01:44:32.686 Post-shutdown script...
> 01:44:32.686 killall jackd
> jackd: no process killed
> 01:44:32.901 Post-shutdown script terminated with exit status=256.
> 01:44:34.688 Could not connect to JACK server as client. Please check the
> messages window for more info.
> The accompanying /var/log/syslog records this:
> Dec  2 01:44:32 ubuntu kernel: [ 7766.542118] cannot submit datapipe for
> urb 0, error -28: not enough bandwidth
> I have read around the place that kernels up to 2.6.20 had usb bandwidth
> allocation which might have caused this, but I'm using what ubuntu calls
> 2.6.22-14-rt.  So I shouldn't be getting bandwidth errors.  Especially when
> the previous kernel worked fine with the same physical configuration of usb
> socket + sound card.
> Plus, audacity seems to be able to achieve simultaneous stereo playback and
> capture.  So it can't be beyond the capacity of the alsa driver...
> Any ideas?  I'm not averse to the idea of compiling a new kernel, but I'd
> want to be sure that is where the problem is before getting into it....
> All the best,
> Howard

all the best,


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