Le Sun, 06 Apr 2014 11:01:13 +0200,
Rainer Dorsch <ml@xxxxxxxxxxx> a écrit :
> Hi,
>
> I have two usb devices on my system, which register with the
> snd_usb_audio module, a USB Headset and a USB webcam (has a
> microphone built-in). I use
>
You must provide an index for each single sound card and cards_limit=n
where n is the actual number of audio cards. With recent kernels, you
may also have to blacklist the snd-usb-audio
in /etc/modprobe.d/blacklist, if you don't want them to be loaded by
udev in the wrong order at boot time.
>
> in modprobe.d to keep the usb devices away from card index 0, since I
> want to be snd_hda_intel the default.
>
> That works well as long as I do not plug in the USB webcam. If I plug
> in the USB webcam, the webcam grabs card index 0.
>
> Does anybody understand why that is?
>
> Here are some more detailed data (the usb device asr both from
> Logitech):
>
> blackbox:~# lsusb
> Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 001 Device 006: ID 046d:0825 Logitech, Inc. Webcam C270
> Bus 001 Device 005: ID 046d:0a44 Logitech, Inc.
> Bus 001 Device 004: ID 04b4:6560 Cypress Semiconductor Corp.
> CY7C65640 USB-2.0 "TetraHub"
> Bus 001 Device 003: ID 0781:5567 SanDisk Corp. Cruzer Blade
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Bus 003 Device 002: ID 046d:c05b Logitech, Inc. M-U0004 810-001317
> [B110 Optical USB Mouse]
> Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> blackbox:~# cat /proc/asound/cards
> 0 [U0x46d0x825 ]: USB-Audio - USB Device 0x46d:0x825
> USB Device 0x46d:0x825 at usb-0000:00:1a.7-5.4,
> high speed
> 1 [Headset ]: USB-Audio - Logitech USB Headset
> Logitech Logitech USB Headset at
> usb-0000:00:1a.7-5.1, full speed
> 2 [Intel ]: HDA-Intel - HDA Intel
> HDA Intel at 0xfe7f4000 irq 45
> blackbox:~# cat /proc/asound/modules
> 0 snd_usb_audio
> 1 snd_usb_audio
> 2 snd_hda_intel
> blackbox:~# cat /etc/modprobe.d/alsa-base.conf
> # autoloader aliases
> install sound-slot-0 /sbin/modprobe snd-card-0
> install sound-slot-1 /sbin/modprobe snd-card-1
> install sound-slot-2 /sbin/modprobe snd-card-2
> install sound-slot-3 /sbin/modprobe snd-card-3
> install sound-slot-4 /sbin/modprobe snd-card-4
> install sound-slot-5 /sbin/modprobe snd-card-5
> install sound-slot-6 /sbin/modprobe snd-card-6
> install sound-slot-7 /sbin/modprobe snd-card-7
> # Cause optional modules to be loaded above generic modules
> install snd /sbin/modprobe --ignore-install snd && { /sbin/modprobe
> --quiet snd-ioctl32 ; /sbin/modprobe --quiet snd-seq ; : ; }
> install snd-rawmidi /sbin/modprobe --ignore-install snd-rawmidi && {
> /sbin/modprobe --quiet snd-seq-midi ; : ; }
> install snd-emu10k1 /sbin/modprobe --ignore-install snd-emu10k1 && {
> /sbin/modprobe --quiet snd-emu10k1-synth ; : ; }
> # Keep snd-pcsp from beeing loaded as first soundcard
> options snd-pcsp index=-2
> # Keep snd-usb-audio from beeing loaded as first soundcard
> options snd-usb-audio index=-2
> # Prevent abnormal drivers from grabbing index 0
> options bt87x index=-2
> options cx88_alsa index=-2
> options snd-atiixp-modem index=-2
> options snd-intel8x0m index=-2
> options snd-via82xx-modem index=-2
> blackbox:~#
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