Re: Udev. Problems with ordering hardware using /dev/video

On Tue, Jul 31, 2007 at 19:47:51 +0200, Nigel Henry wrote:
> I've managed to resolve most of my problems on my own, but Udev has beaten me.
>
> Sarge is not a problem, as it's using the 2.4.27, or 2.6.8 kernel, and Udev is
> not in the equation. Etch has a 2.6.8, and a 2.6.17 kernel, and Lenny has a
> 2.6.11, and a 2.6.17 kernel. The problem is with the 2.6.17 kernel that uses
> Udev.
>
> My TV card was set as /dev/video0, and some time later the webcam was set
> as /dev/video1. this works fine with the pre 2.6.17 kernels (no Udev), and
> the TV card consistently is /dev/video0, and the webcam /dev/video1. Booting
> with the 2.6.17 kernel is a different scenario. Very hit and miss. Sometimes
> I boot up and starting Xawtv, I get the TV /dev/video0. Othertimes I bootup
> and start Xawtv, and get my webcam /dev/video1.

This flip-flopping is, AFAIK, more the fault of the newer kernel then the fault of udev. If the kernel would always load the modules in the same order then udev would probably assign the device nodes in a consistent manner.

> I've worked with ordering my soundcards, and the lines are quite simple, and
> have seen that something similar is possible with Udev, although the lines a
> re a bit more complex. Could someone give me a couple of lines so that my TV
> card is always /dev/video0, and the webcam is always /dev/video1?
>
> Any help gratefully appreciated for fixing this annoying problem.

Post the output of:

udevinfo -a -p $(udevinfo -q path -n /dev/video0)

udevinfo -a -p $(udevinfo -q path -n /dev/video1)

(Only the blocks that have things like "ATTRS{model}" or "ATTRS{vendor}"  are important.)

-- 
Regards,            | 
http://users.icfo.es/Florian.Kulzer
          Florian   |


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