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[wlug] device order

 
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John R. McPherson jrm21@c...
Wed Aug 2 11:35:37 NZST 2006


On Wed, Aug 02, 2006 at 09:35:49AM +1200, Craig Box wrote:
> 
> > Less customisation. Right now, your fresh install is broken out of
> > the box. You set up ubuntu and sound works. Plug in a usb phone and
> > configure skype to use /dev/dsp1. Cool. The next time you boot the
> > computer, all your system sounds are coming through the phone and
> > skype is using the system speakers. Most users want devices to NOT
> > MOVE ABOUT.     
> 
> Does this actually happen?  What I've seen is Linux assigns things based on
> something like PCI order, which is likely not to change unless you move
> cards around.
> 
> With USB things, its possible that plugging them in in a different order
> could swap the /dev/dsp numbers, but with a single PCI sound card and a USB
> one, I wouldn't expect it to swap.

I've encountered this with video devices - from what I could tell,
usb hardware was detected before pci hardware, so if the usb webcam was
plugged in on boot, then it got video1 and the pci card got video2.

I don't recall the order ever being non-deterministic though :)

John




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