Re: init script with hotplug & usb audio

[Takashi Iwai <tiwai@suse.de>]

At Thu, 26 Sep 2002 10:20:25 +0200,
Duncan Sands wrote:
> 
> I have a usb webcam with audio plugged into my computer,
> and a cs46xx sound card inside.
> 
> When I boot the following sequence occurs:
> 
> (1) the hotplug subsytem is started.  This automatically
> loads the snd-usb-audio module and the modules it
> depends on.  In particular /proc/asound/ is created.
> 
> (2) the alsasound init script is run.  It detects that
> /proc/asound/ exists, and exits at once.  In particular
> it does not restore mixer levels for the cs46xx card.
> 
> I solved this by commenting out the check for /proc/asound/
> in the init script.  The problem goes deeper though, especially
> when things like usb audio devices are around, which can be
> hotplugged: maybe sound card modules should really be calling
> the hotplug subsystem when they are initialize.  The hotplug
> script would then restore mixer settings etc...
> 
> Thoughts?

i solved like the following:

- add snd-usb-* (and oss audio module) to hotplug's blacklist
  to avoid to load them from the modules.usermap.
- add a usermap for the usb audio devices to call its own start-up
  script.  the script starts the alsasound init script inside before
  loading the snd-usb-audio module (if no /proc/asound exists), so
  that it asssures that the normal PCI devices are assigned prior to
  usb devices. 


Takashi


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