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----- Original Message -----

quoted text
> From: "Renato"

> To: "Clemens Ladisch"

> Cc: "linux-audio-user"

> Sent: Tuesday, August 16, 2011 5:55:52 PM

> Subject: Re: [LAU] setting up hardware priority

>

> On Tue, 16 Aug 2011 17:34:40 +0200

> Clemens Ladisch  wrote:

>

> > Renato wrote:

> > > Hello, I'm trying to find out if plugging my USB soundcard in

> > > different USB ports of my laptop makes any difference. If I got

> > > it

> > > right, I should choose the one with the lowest IRQ. So, with

> > > "lspci

> > > -v" I can see I have 4 "USB Controller" devices, each with their

> > > own IRQ (lowest one is 16 which seems to be shared by video

> > > card...) - but how do I know which one my sound card is plugged

> > > into?

In /sys/devices/pciXXXXX, try:

for i in `find|grep usb|grep product`; do echo $i; cat $i; done

I only have /sys/devices/pci0000:00 here.

It gives the name of the product, maybe it can help.

Try other files too. For my usb key, I see:

/sys/devices/pci0000:00/0000:00:1a.7/usb1/1-3> ls

1-3:1.0              bDeviceSubClass     configuration  idProduct     remove

authorized           bmAttributes        descriptors    idVendor      serial

avoid_reset_quirk    bMaxPacketSize0     dev            manufacturer  speed

bcdDevice            bMaxPower           devnum         maxchild      subsystem

bConfigurationValue  bNumConfigurations  devpath        power         uevent

bDeviceClass         bNumInterfaces      driver         product       urbnum

bDeviceProtocol      busnum              ep_00          quirks        version
Also, run 'dmesg' when you plug your audio card and see what it says

(if it says something).
HTH

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