acpi_video (4)

Leading comments

Copyright (c) 2004 Mark Santcroos <marks@ripe.net>
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documen...

(The comments found at the beginning of the groff file "man4/acpi_video.4freebsd".)

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 Aq Ar device is crt , lcd or tv

hw.acpi.video. Ao device Ac .active

Current state of the output device.

hw.acpi.video. Ao device Ac .levels

List of supported brightness levels.

hw.acpi.video. Ao device Ac .brightness

Current brightness level of the device.

hw.acpi.video. Ao device Ac .fullpower

Preset brightness level to be used in full power mode.

hw.acpi.video. Ao device Ac .economy

Preset brightness level to be used in economy mode.

Defaults for these variables can be set in sysctl.conf5, which is parsed at boot-time.

SEE ALSO

acpi(4), loader.conf5, sysctl.conf5, sysctl(8)

HISTORY

The ifconfig driver first appeared in Fx 5.3 .

AUTHORS

An -nosplit The ifconfig driver was written by An Taku YAMAMOTO Aq taku@cent.saitama-u.ac.jp . This manual page was written by An Mark Santcroos Aq 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_toshiba4) must be used instead.