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INTEL_BACKLIGHT(1)	FreeBSD	General	Commands Manual	    INTEL_BACKLIGHT(1)

NAME
     intel_backlight --	control	backlight on various modern Intel GPUs

SYNOPSIS
     intel_backlight [decr | incr | n]

DESCRIPTION
     This utility allows to control the	brightness of the backlight on certain
     Intel GPUs, including i915.

     The current backlight value is reported every time	the program is run.
     Additionally, if the argument are invalid then a help message is shown.

     The backlight brightness levels that decr and incr	operate	on are as fol-
     lows: 1, 2, 4, 6, 9, 12, 16, 20, 25, 30, 36, 43, 51, 60, 70, 80, 90, 100.

     The options are as	follows:

     decr  Decrease the	backlight value	to the nearest brightness level.

     incr  Increase the	backlight value	to the nearest brightness level.

     n	   Change the backlight	value to n where n should be between 0 and
	   100.	Providing any other integer results in setting the backlight
	   back	to the default value of	100.

FILES
     /usr/local/share/examples/intel-backlight/asmc_backlight.sh
       An example of a script adjusting	brightness automatically based on the
       input of	the MacBook asmc(4) light sensor driver.

     /usr/local/share/examples/intel-backlight/isl_backlight.sh
       An example of a script adjusting	brightness automatically based on the
       input of	the isl(4) driver, which is currently not part of standard
       FreeBSD.

EXIT STATUS
     The intel_backlight utility exits 0 on success, and >0 if an error	oc-
     curs.

DIAGNOSTICS
     The command may fail for any of the following reasons:

     Couldn't initialize PCI system: Device not	configured
     The user does not have required permissions to execute intel_backlight as
     it	probably hasn't	got the	setuid bit set during installation.  The solu-
     tion is either to reinstall this program or to run	the command as root.

COMPATIBILITY
     See intel_chipset.h in the	source distribution of intel_backlight for a
     list of supported chipsets.

SEE ALSO
     acpi_video(4), asmc(4), isl(4)

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

     intel_backlight is	based on the code that has been	taken from the project
     developing	test suite and tools for DRM/KMS drivers, which	can be found
     here: http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/

AUTHORS
     This manual page was written by Mateusz Piotrowski	<0mp@FreeBSD.org>.

FreeBSD	13.0			 May 28, 2018			  FreeBSD 13.0

NAME | SYNOPSIS | DESCRIPTION | FILES | EXIT STATUS | DIAGNOSTICS | COMPATIBILITY | SEE ALSO | HISTORY | AUTHORS

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