Comment 7 for bug 224636

Here is workaround for M50Sv and maybe other laptop controled by asus-laptop driver

This is compilation from
Copy files from attached file to corresponding directories

Enables ASUS Light Sensor switching

Brightness control scripts (working with ASUS Light Sensor enabled)

Script that saves settings for ASUS Light Sensor

sudo update-rc.d asus-ls defaults

sudo /etc/init.d/acpid restart

If Brightness down key doesn't work
change first line of /etc/acpi/events/asus-brightness-down
to this
event=hotkey ATKD 0000002[0123456789abcdef]

Sorry for my English