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.

SYSCTLS

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

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