[LAU] Blacklisting undesired audio devices

[Jouni Rinne]

28.06.2011 19:33, R.Wolff kirjoitti:
> Hi folks,
> I'm wanting to blacklist some audio devices so that the drivers don't get loaded
> on boot.
> 
> 
> avl5 at funkster1:~$ cat /proc/asound/cards
>  0 [SB             ]: HDA-Intel - HDA ATI SB
>                       HDA ATI SB at 0xfe8f0000 irq 16
>  1 [M1010LT        ]: ICE1712 - M Audio Delta 1010LT
>                       M Audio Delta 1010LT at 0xe800, irq 20
>  2 [U0x46d0x8ce    ]: USB-Audio - USB Device 0x46d:0x8ce
>                       USB Device 0x46d:0x8ce at usb-0000:00:12.2-2, high speed
>  3 [HDMI           ]: HDA-Intel - HDA ATI HDMI
>                       HDA ATI HDMI at 0xfe9ec000 irq 44
>  4 [BCR2000        ]: USB-Audio - BCR2000
>                       BEHRINGER BCR2000 at usb-0000:00:12.1-1, full speed
>  5 [DR880          ]: USB-Audio - DR-880
>                       BOSS DR-880 at usb-0000:00:12.0-1, full speed
> 
> 
> I want to blacklist 2 + 3 (webcam and RADEON HD4650 HDMI).
> I'm using AVLinux 5 (debian 6.0.1) with the custom pae_kernel 2.6.39-2 and after
> reading the alsa
> website for the correct ordering of cards on boot, I learned that we should use
> the 'slots' option instead of 'index=nn'. The appropriate line in
> /etc/modprobe.d/alsa-base.conf is now:
> 
>     options snd slots=snd-hda-intel,snd-ice1712
> 
> But I couldn't find anything about blacklisting. Mybe I'm just to blind to see. :(
> 
> So if anybody could help me out, I'd be very grateful.
> 
> TIA,
> Raphael ;)
>

At least on Gentoo it is /etc/modprobe.d/blacklist.conf (the actual path and/or
filename may vary on different distros). Put a line containing 'blacklist
snd_hda_intel' or some other kernel module on it.

Device 2 uses snd_usb_audio-module so by blacklisting it you lose all
USB-audio-devices. As for the admittedly stupid HDMI device (3), on current
kernels it comes hand-to-hand with snd_hda_intel, so you can't have the one
without the other.

JR