Re: [LAU] setting up hardware priority

On Wed, 17 Aug 2011 09:59:40 +0200 (CEST)
Cedric Roux <sed@email-addr-hidden> wrote:

> ----- Original Message -----
> > From: "Renato" <rennabh@email-addr-hidden>
> > To: "Clemens Ladisch" <clemens@email-addr-hidden>
> > Cc: "linux-audio-user" <linux-audio-user@email-addr-hidden>
> > 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 <clemens@email-addr-hidden> 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
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