marc@milou:~$ setkeycodes 0xd4 $KEY_BRIGHTNESSUP
setkeycodes: non-null even number of arguments expected
Usage: setkeycodes [options] scancode keycode ...
 (where scancode is either xx or e0xx, given in hexadecimal,
  and keycode is given in decimal)
valid options are:
        -h --help         display this help text and exit
        -V --version      display version information and exit
marc@milou:~$ setkeycodes d4 $KEY_BRIGHTNESSUP
setkeycodes: non-null even number of arguments expected
Usage: setkeycodes [options] scancode keycode ...
 (where scancode is either xx or e0xx, given in hexadecimal,
  and keycode is given in decimal)
valid options are:
        -h --help         display this help text and exit
        -V --version      display version information and exit
marc@milou:~$ setkeycodes e0d4 $KEY_BRIGHTNESSUP
setkeycodes: non-null even number of arguments expected
Usage: setkeycodes [options] scancode keycode ...
 (where scancode is either xx or e0xx, given in hexadecimal,
  and keycode is given in decimal)
valid options are:
        -h --help         display this help text and exit
        -V --version      display version information and exit
marc@milou:~$ setkeycodes -h
Usage: setkeycodes [options] scancode keycode ...
 (where scancode is either xx or e0xx, given in hexadecimal,
  and keycode is given in decimal)
valid options are:
        -h --help         display this help text and exit
        -V --version      display version information and exit
marc@milou:~$ setkeycodes e005 $KEY_BRIGHTNESSDOWN
setkeycodes: non-null even number of arguments expected
Usage: setkeycodes [options] scancode keycode ...
 (where scancode is either xx or e0xx, given in hexadecimal,
  and keycode is given in decimal)
valid options are:
        -h --help         display this help text and exit
        -V --version      display version information and exit