acpi_video man page on FreeBSD

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ACPI_VIDEO(4)		 BSD 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.

BSD			       November 8, 2004				   BSD
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