Brightness control doesn't work by default in Ubuntu 13.04.
Solution for [12.10](https://askubuntu.com/questions/262003/brightness-not-working-on-lenovo) doesn't work, also as [this](https://askubuntu.com/questions/286343/screen-brightness-very-dim-problem-ubuntu-13-04-dell-xps-13-2013)

Any idea how to fix it?

Update:

After research I found how to change brightness manually. What need to do is to type in terminal:

```
echo 2000 | sudo tee /sys/class/backlight/intel_backlight/brightness

```

It will reduce brightness by half, but still would be good to find solution which will allow to use keyboard for changing brightness.

Update2:

Found solution, see below