|
|
RipCode builds video transcoding device on Linux base
|
|
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) vari- ables 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. BSD
November 8, 2004 BSD
