intel_backlight_fbsd

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This allows to control the backlight level on certain Intel(R) GPUs, including i915.

This has been taken from intel-gpu-tools which can be found here: http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/

Originally ported to FreeBSD by "emmex" of the FreeBSD forums.

FreeBSD Build: pkg install libpciaccess libdrm make make install

OpenBSD Build: make make install

(this installs intel_backlight setuid root, so any user can execute it).

Usage: $ intel_backlight current backlight value: 30% (281/937) $ intel_backlight 50 current backlight value: 15% (141/937) set backlight to 50% (469/937) $ intel_backlight incr current backlight value: 50% (469/937) set backlight to 51% (478/937) $ intel_backlight incr current backlight value: 51% (478/937) set backlight to 60% (562/937) $ intel_backlight incr current backlight value: 60% (562/937) set backlight to 70% (656/937) $ intel_backlight decr current backlight value: 70% (656/937) set backlight to 60% (562/937) $ intel_backlight decr current backlight value: 60% (562/937) set backlight to 51% (478/937)

The included example allows adjusting brightness automatically based on the input of the isl driver (currently not part of standard FreeBSD).

Usage: ./isl_backlight.sh &

OpenBSD Notes: Requires a kernel capable of concurrent opening of /dev/xf86, via machdep.allowaperture=3.