Getting the question more generic:
How can I change the permissions to alter the state of a LED/light using
I've got a Thinkpad and would like to use the ThinkLight (the white flash light above the screen designed to light up the keyboard) for notifications on incoming Jabber messages.
It is easy to realise as one only needs to change
/sys/class/leds/tpacpi::thinklight/brightness to 255. I'll do it with a simple Bash script, which will let the light blink for three times.
But to be able to do this, I need to change the permissions, that not only root is able to change this file.
And I do not want to
sudo chmod o+w /sys/class/leds/tpacpi::thinklight/brightness after each and every boot.
I think, the best solution is using
udev for this. However, I've never used
udev before and I'm quite confused by the tutorials I found online.
I tried this
as well as
But it does not work. Though I'm not getting errors while running
udevadm test /class/leds
Thanks for any help and hits. Or maybe other solutions.