Udev rules problem (2 webcams, assigning videoX devices)

Question

I've got a built-in webcam (notebook) and an external one connected too, different vendor/product IDs.
I want the built-in cam to be video0 and the external one video1.
I added a file /etc/udev/rules.d/25-name-video-devices.rules containing:
#external cam has ID eb1a:2571
SUBSYSTEM=="video4linux", BUS=="usb", SYSFS{idVendor}=="eb1a", SYSFS{idProduct}=="2571", NAME="video1"
#internal cam has ID 5986:030c
SUBSYSTEM=="video4linux", BUS=="usb", SYSFS{idVendor}=="5986", SYSFS{idProduct}=="030c", NAME="video0"
but it doesn't seem to have effect. After a reboot, the internal cam is now video1 and the external one video0..
any ideas?

Answer 1

SYSFS is deprecated.
Pastebin these somewhere:
udevadm info -a --name /dev/video0
udevadm info -a --name /dev/video1
Edit: This is probably what you want:
SUBSYSTEM=="video4linux", ATTRS{idVendor}=="eb1a", ATTRS{idProduct}=="2571", NAME:="video1"
SUBSYSTEM=="video4linux", ATTRS{idVendor}=="5986", ATTRS{idProduct}=="030c", NAME:="video0"
Edit2: Although, messing with the kernel's own names is inelegant (e.g. a third webcam will play havoc with the names until you write a rule for that too), better with symlinks:
SUBSYSTEM=="video4linux", ATTRS{idVendor}=="eb1a", ATTRS{idProduct}=="2571", SYMLINK+="videoext"
SUBSYSTEM=="video4linux", ATTRS{idVendor}=="5986", ATTRS{idProduct}=="030c", SYMLINK+="videoint"
Yet another edit: Specifying SUBSYSTEM is a bit more elegant than:  KERNEL=="video[0-9]*"
Last edited by brebs (2013-04-26 16:38:24)