----- Original Message ----- > From: "Renato" <rennabh@xxxxxxxxx> > To: "Clemens Ladisch" <clemens@xxxxxxxxxx> > Cc: "linux-audio-user" <linux-audio-user@xxxxxxxxxxxxxxxxxxxx> > Sent: Tuesday, August 16, 2011 5:55:52 PM > Subject: Re: setting up hardware priority > > On Tue, 16 Aug 2011 17:34:40 +0200 > Clemens Ladisch <clemens@xxxxxxxxxx> 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 _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
