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backlight INSTALL
=================

Supported systems
-----------------

- Linux: requires video ACPI module,
- FreeBSD: requires the `acpi_video(4)` loaded,
- OpenBSD.

Installation on Linux
---------------------

First, build the program:

	make

On Linux, adjusting the brightness can be done as normal user if you have write
access to the appropriate files which are usually under */sys*.

The recommandation is to install the udev rule which change the ownership of the
brightness file to `video` group and writable by users in this group. Use the
`install-udev` for that purpose. Then don't forget to check if you are part of
the video group.

	make install
	make install-udev

Otherwise, as alternative you can simply install the binary as setuid if you
don't run udev.

	make install-setuid

Installation on FreeBSD
-----------------------

In FreeBSD, it's required to have the tool in setuid as there is no way to
change sysctl values from a regular user.

Also, you will need the ACPI video module, add the following to your
*/boot/loader.conf*:

	acpi_video_load=YES

Alternatively, you can compile this module into the kernel.

Then install using:

	make
	make install-setuid