How do I create a udev rule for my logitech webcam [closed]

Question

With my webcam plugged in at boot, it always defaults to /dev/video0 and my TV-card defaults to /dev/video1. Tvtime defaults is using /dev/video0. I know that I can run Tvtime with the --device option and force it to switch to /dev/video1, but if i happen to have my webcam unplugged when I boot, the TV-card becomes video0.

This is very inconvenient, as I have tried to write a "udev" rule, to make the webcam video5 but have not been able to get it to work.

This is the rule I tried to use:

SUBSYSTEM=="video4linux", BUS=="usb", SYSFS{idvendor}=="046d", SYSFS{idProduct}=="0807", NAME="video5"

I saved this in /etc/udev/rules.d/75-mystuff.rules, and also tried with a lower number, 15-mystuff.rules, which didn't work.

I am using Ubuntu 10.04 64bit. Any help to resolve this will be very much appreciated.

Thanks

Answer 1

Jan Claesys idea is likely more practical, but...

SYSFS syntax is deprecated or going to be deprecated. You should use ATTRS. The rule should look like:

SUBSYSTEM=="video4linux", BUS=="usb", ATTRS{vendor}=="0x046d", ATTRS{device}=="0x0807", NAME="video5"

Note the 0x to denote a hexadecimal value.

I can't test the rule on my end, but I expect it to work.

Answer 2

If using the --device option is not really a problem, you can probably use the link to the device under /dev/v4l/by-id/ instead. I think that one should always be the same...