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ACPI_VIDEO(4)	       FreeBSD Kernel Interfaces Manual		 ACPI_VIDEO(4)

NAME
     acpi_video	-- ACPI	Video Extensions driver

SYNOPSIS
     device acpi_video

DESCRIPTION
     This driver uses the ACPI Video Extensions	to control display switching
     and backlight brightness.	The availability of the	sysctl(8) variables
     depends on	the functions offered by the host's ACPI implementation.

SYSCTL VARIABLES
     The following sysctls are currently implemented, where <device> is	crt,
     lcd, or tv:

     hw.acpi.video.<device>.active
	     Current state of the output device.

     hw.acpi.video.<device>.levels
	     List of supported brightness levels.

     hw.acpi.video.<device>.brightness
	     Current brightness	level of the device.

     hw.acpi.video.<device>.fullpower
	     Preset brightness level to	be used	in full	power mode.

     hw.acpi.video.<device>.economy
	     Preset brightness level to	be used	in economy mode.

     Defaults for these	variables can be set in	sysctl.conf(5),	which is
     parsed at boot-time.

SEE ALSO
     acpi(4), loader.conf(5), sysctl.conf(5), sysctl(8)

HISTORY
     The acpi_video driver first appeared in FreeBSD 5.3.

AUTHORS
     The acpi_video driver was written by Taku YAMAMOTO
     <taku@cent.saitama-u.ac.jp>.  This	manual page was	written	by Mark
     Santcroos <marks@ripe.net>.

BUGS
     Some systems only perform output switching	via SMM	even though they
     export the	proper information via ACPI.  On such systems, the proper
     hotkeys or	OEM driver (for	example, acpi_toshiba(4)) must be used
     instead.

FreeBSD	10.1		       November	8, 2004			  FreeBSD 10.1

NAME | SYNOPSIS | DESCRIPTION | SYSCTL VARIABLES | SEE ALSO | HISTORY | AUTHORS | BUGS

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=acpi_video&sektion=4&manpath=FreeBSD+8.3-RELEASE>

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