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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 options snd-usb-audio index=-2 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:~# -- Rainer Dorsch http://bokomoko.de/ |
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