I've become somehow annoyed by the too bright, especially at night, Raspberry Pi status lights. Two of my Pis run all the time and I don't want to put them into any closed cases not to overheat them.
As simple as it is to disable the green status LED by issuing (as root):
echo 0 >/sys/class/leds/led0/brightness
the other LEDs controlling LAN status are somehow troublesome. Thankfully, I've come across a small script that does the job.
and run as root.
The options are:
Usage: llctl r | w<rawvalue> | [ f<mod> ] [ l<mod> ] [ d<mod> ] r: read content of configuration register other parameters are ignored after 'r' w: write <rawvalue> to configuration register (see README) other parameters are ignored after 'w' f, l, d select the fast ethernet, link, duplex status LED <mod> can be 0, 1, s, t 0: switch off LED 1: switch on LED s: show status as designed for this LED t: toggle LED. If LED was set to 's' before, 't' does nothing
So, for example, to turn off ethernet status LED, issue:
sudo ./llctl f0
and watch the light being disabled.
Now, only the red status LED is on, just enough to remind me the Raspberry is still running!