[linux-audio-user] Tascam US-122, Laptop and Keyboard

[Ryan Gallagher]

On Tue, 2005-03-22 at 10:08 -0500, Spencer Russell wrote:
> Wow, seems like you're having pretty much exactly the same kinds
> of troubles I've had, right down to the occasional keyboard
> lockup. Maybe something strange with the via chipset?

Nope, keyboard lockups happen here too.  And others have reported the
same, for me it's when I unplug my ua-25 so it's not card specific.

> On Wed, Mar 23, 2005 at 02:32:22AM +0000, Steve Fosdick wrote:
> > Jackd will sometimes run for a few seconds without error but soon starts
> > reporting errors of the form:
> > 
> > delay of 24606.000 usecs exceeds estimated spare time of 23134.000; restart ...
> > delay of 24779.000 usecs exceeds estimated spare time of 23134.000; restart ...
> > delay of 24781.000 usecs exceeds estimated spare time of 23134.000; restart ...
> > delay of 24741.000 usecs exceeds estimated spare time of 23134.000; restart ...
> > jackd watchdog: timeout - killing jackd
> > 

See http://lalists.stanford.edu/lau/2005/03/0688.html which has gone
ignored on both this list and the jack devel list.

> > I have tried kernels 2.6.10, 2.6.11, 2.6.11.4 and 2.6.11.5.  The 2.6.11
> > series seems to be closer to working.

I've tried from 2.6.8.1 up to 2.6.12.rcX, no love.

I also suspected IRQ issues, and digging through kernel-parameters.txt
brought me this boot option: acpi_irq_balance

Adding this to my grub.conf resulted in my usb bus no longer being
shared with my graphics adapter and about 5 other things.

Unfortunately this change in IRQ assignment seems to have zero effect.
I'm not sure what's to blame for the "delay of XXX.XXX usecs" messages,
however I know that more USB users than you are troubled by this.  My
intuitively ordered list of suspects is:

1) kernel
2) alsa-drivers
3) jackd

and of course superseding all is my flaky hardware and software setup :)
however as I find more people with these issues I'm less likely to blame
myself.  The ua-25 works flawlessly in OS X btw.

-good luck

-- 
Ryan Gallagher <ruinaudio at comcast.net>