[LAU] USB audio interface and a buggy USB controller

[Jeremy Jongepier]

On 09/07/2010 08:50 AM, Clemens Ladisch wrote:
> Joan Quintana wrote:
>> It seems that my new laptop has a buggy USB controller (lspci says
>> 'Intel Corporation 5 Series/3400 Series Chipset USB2') and this causes
>> JACK to fail in 'duplex mode' and 'only recording mode'
>>
>> $ /usr/bin/jackd -dalsa -dhw:2 -r44100 -p1024 -n2
>> ...
>> ALSA: could not start playback (Broken pipe)
>> DRIVER NT: could not start driver
>> ...
>>
>> I have an Edirol UA-25EX.
>>
>> I read about this problem in:
>> *http://ubuntuforums.org/showthread.php?p=9812317
>> where points to
>> *http://lists.linuxaudio.org/pipermail/linux-audio-user/2010-June/070365.html
> 
> If you had this buggy controller, the sound output would be silent or
> garbled, but the driver wouldn't be able to detect this.
> 
> Your error messages show that there is some other problem.
> 
> Is there some error message in the system log when this happens?
> 

Hello Clemens,

I've tested this on a PC with the exact same chipset and this is the
error message in the system log when I start JACK in duplex mode:

[ 6894.097634] usb 1-1.4: new full speed USB device using ehci_hcd and
address 14
[ 6894.195761] usb 1-1.4: configuration #1 chosen from 1 choice
[ 6930.941407] cannot submit datapipe for urb 0, error -28: not enough
bandwidth

More info here: http://ubuntuforums.org/showpost.php?p=9844242&postcount=20

Best,

Jeremy