Thinkpad

E300

Backlight

Source

Running with Fedora 23 in I3:

$ sudo dnf install -y xbacklight

~ $  cat ~/.config/i3/config | grep XF86MonBrightness
bindsym XF86MonBrightnessUp exec xbacklight -inc 20 # increase screen brightness
bindsym XF86MonBrightnessDown exec xbacklight -dec 20 # decrease screen brightness
```Running with Fedora 23 in I3:

```bash
$ sudo dnf install -y xbacklight

~ $  cat ~/.config/i3/config | grep XF86MonBrightness
bindsym XF86MonBrightnessUp exec xbacklight -inc 20 # increase screen brightness
bindsym XF86MonBrightnessDown exec xbacklight -dec 20 # decrease screen brightness