Интерактивная система просмотра системных руководств (man-ов)
acpi_video (4)
>> acpi_video (4) ( FreeBSD man: Специальные файлы /dev/* )
BSD mandoc
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.
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.
