I was browsing through the file
/usr/src/linux/drivers/acpi/asus_acpi.c on my laptop where I noticed this:
echo 1 > /proc/acpi/asus/mled
will turn on the mail-arrived led on the front-right of the laptop. It is turned off by writing a “0” to the file.
Likewise, the Wi-Fi activity led can be turned on and off by writing to