XMonad plugin for brightness control (linux). Got the idea from xmonad-vanessa.

Note: This plugin was merged in xmonad-extras, no further development will be made in this repository.

Copy src/XMonad/Util/Brightness.hs to ~/.xmonad/lib/XMonad/Util/Brightness.hs.

This package exports three functions: increase, decrease and change.

• increase: Call change to update the brightness by +150;
• decrease: Call change to update the brightness by -150;
• change: Receive a (Int -> Int) function and perform the needed IO to change brightness;

Note that change will return IO(). If you want to call it directly, be sure to return X() if whitin XMonad.

Inside ~/.xmonad/xmonad.hs (Manual keybindings):

import qualified Data.Map as M
import qualified Graphics.X11.ExtraTypes.XF86 as XF86
(...)
import qualified XMonad.Util.Brightness as Bright
(...)

myKeys conf@(XConfig {XMonad.modMask = modm}) = M.fromList $
(...)
++
[ ((0, XF86.xF86XK_MonBrightnessUp), Bright.increase)        -- Increase screen brightness
, ((0, XF86.xF86XK_MonBrightnessDown), Bright.decrease)]     -- Decrease screen brightness

In a normal linux environment, the file /sys/class/backlight/intel_backlight/brightness will only be writable by root. To allow your user to write this file, you can:

• Recomended: Create a group with your user and root and give permissions to this group to write the file;
• Small Security risk: Allow anyone to write the file through 646 permissions: -rw-r--rw-;