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Manual Pages  — ACPI_VIDEO

NAME

acpi_video – ACPI Video Extensions driver

CONTENTS

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 <Mt taku@cent.saitama-u.ac.jp>. This manual page was written by Mark Santcroos <Mt 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.

ACPI_VIDEO (4) November 8, 2004

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