[LAU] Issues with JACK

[Ralf Mardorf]

On Tue, 2013-03-05 at 08:45 -0800, Gabriel Beddingfield wrote:
> On Mon, Mar 4, 2013 at 3:26 AM, Gabbe Nord <gabbe.nord at gmail.com> wrote:
> > Hmm, alarming! I do use both USB keyboard and USB mouse. My soundcard is
> > also USB. I do have alot of other devices plugged in aswell to my USB. Is
> > there any way I can fix this, other then getting "real" plugs for the USB
> > keyboard/mouse? Like I said, there's still a couple of devices that uses USB
> > even if I get rid of the mouse/keyboard.
> 
> USB devices are allowed to reserve bandwidth... and that affects every
> device attached to the same USB hub.  Now, you might say, "I don't use
> a USB hub" -- but that's not true.  Your PC has one or two USB hubs
> that it uses internally.  In my case, I had a USB audio device on the
> same hub as a USB Webcam.  Even when I wasn't using the Webcam, it was
> reserving bandwidth.  Thing would be running fine, then all the sudden
> audio comes crashing down with an xrun.
> 
> For me the PC had two internal hubs.  I used a different USB port
> (attached to the non-webcam-hub) and the problem was solved.
> 
> I'm not saying this is your problem... but use something like 'sudo
> lsusb -t' and inspect which devices are connected to which hubs.
> Unplug as much as you can.  Try different ports.

Slot plates for using the USB ports provided by the mobo do cost around
EUR 2 only.
FWIW it's possible to unbind USB devices, assumed an unneeded port
should share the IRQ with something that is important.