order of pci detection gives problem with sounddevices and

order of pci detection gives problem with sounddevices and

[Kristof Vansant]

No sound because a not primary sound device is loaded and gets
device /dev/dsp1

Quotes from the bug reports:

Examples:
1) When my logitech orbit/sphere webcam is plugged on reboot, the
primary audio device is the USB Mixer, with only a microphone. That
leave me with no audio output.

Should the modules be loaded in a specific order? The webcam being one of the lasts.

2) Same error happens when bttv is detected before the sound card.

Solution?:
So, PCI ordering seems annoying. :-) Possibly an easier one: deprioritising USB
devices behind PCI devices. I had the same issue occur with my webcam USB
capture device.

Could hotplug or udev solve this problem or should this issue be resolved on a higher level??


related bug reports:
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id\x106748
https://bugzilla.ubuntu.com/show_bug.cgi?id\x1293

-- 
lupusBE (Kristof Vansant Belgium)



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Re: order of pci detection gives problem with sounddevices and applications

[Greg KH]

On Thu, Nov 25, 2004 at 03:46:30AM +0100, Kristof Vansant wrote:
> No sound because a not primary sound device is loaded and gets
> device /dev/dsp1
> 
> Quotes from the bug reports:
> 
> Examples:
> 1) When my logitech orbit/sphere webcam is plugged on reboot, the
> primary audio device is the USB Mixer, with only a microphone. That
> leave me with no audio output.
> 
> Should the modules be loaded in a specific order? The webcam being one of the lasts.
> 
> 2) Same error happens when bttv is detected before the sound card.
> 
> Solution?:
> So, PCI ordering seems annoying. :-) Possibly an easier one: deprioritising USB
> devices behind PCI devices. I had the same issue occur with my webcam USB
> capture device.
> 
> Could hotplug or udev solve this problem or should this issue be resolved on a higher level??

Yes udev can solve this.  Make udev only create the /dev/dsp1 (or
whatever you want) for your pci sound card, and /dev/dsbfoo for the USB
device.

Good luck,

greg k-h


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