Skip site navigation (1)Skip section navigation (2)

FreeBSD Man Pages

Man Page or Keyword Search:
Man Architecture
Apropos Keyword Search (all sections) Output format
home | help
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 6.2                    November 8, 2004                    FreeBSD 6.2

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+6.2-RELEASE>

home | help