On Wed, 17 Aug 2011 09:59:40 +0200 (CEST) Cedric Roux <sed@xxxxxxx> wrote: > ----- 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). Thanks Cedric, both these methods show which usb controller the device is attached to. But I still have a problem; I have 4 "USB Controller" devices: $ lspci -v |grep -i "usb controller" -A 2 00:1d.0 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #1 (rev 02) (prog-if 00 [UHCI]) Subsystem: Acer Incorporated [ALI] Device 0090 Flags: bus master, medium devsel, latency 0, IRQ 23 -- 00:1d.1 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #2 (rev 02) (prog-if 00 [UHCI]) Subsystem: Acer Incorporated [ALI] Device 0090 Flags: bus master, medium devsel, latency 0, IRQ 19 -- 00:1d.2 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #3 (rev 02) (prog-if 00 [UHCI]) Subsystem: Acer Incorporated [ALI] Device 0090 Flags: bus master, medium devsel, latency 0, IRQ 18 -- 00:1d.3 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #4 (rev 02) (prog-if 00 [UHCI]) Subsystem: Acer Incorporated [ALI] Device 0090 Flags: bus master, medium devsel, latency 0, IRQ 16 -- 00:1d.7 USB Controller: Intel Corporation N10/ICH 7 Family USB2 EHCI Controller (rev 02) (prog-if 20 [EHCI]) Subsystem: Acer Incorporated [ALI] Device 0090 Flags: bus master, medium devsel, latency 0, IRQ 23 and 4 physical USB ports on my laptop, but whichever I plug the soundcard into, it's allways seen on the 1d.7 controller, which seems to be the only USB2 and of course the one with the highest IRQ. However, when I try plugging in a USB bluetooth dongle in different physical ports, it's seen on different Controllers by dmesg. So with the dongle I have actually found which physical port is the 1d.3, which is the one with the lowest IRQ, but when I attach the soundcard to it dmesg reports it on 1d.7. How's that possible? BTW is it possible to reassign IRQ somehow on a laptop? As I said previously the IRQ 16 seems to be shared by the video card, and I read that's not good. thanks again to everyone for help so far, renato _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
