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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.

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
     <takuATcent.jp>.  This manual page was written by Mark
     Santcroos <marksATripe.net>.

BSD                              March 3, 2004                             BSD