Visit The New, Modern Unix Linux Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #787
Difficulty: Medium
In early 2019, Bill Gates responded to the public backlash against billionaires by demanding a lower estate tax.
True or False?
Linux & Unix Commands - Search Man Pages

acpi_video(4) [freebsd man page]

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

Check Out this Related Man Page

ACPI_TOSHIBA(4) 					 BSD/i386 Kernel Interfaces Manual					   ACPI_TOSHIBA(4)

NAME
acpi_toshiba -- Toshiba HCI interface SYNOPSIS
To compile this driver into the kernel, place the following line in your kernel configuration file: device acpi_toshiba Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): acpi_toshiba_load="YES" DESCRIPTION
HCI is Toshiba's Hardware Control Interface which is somewhat uniform across their models. The acpi_toshiba driver allows the user to manip- ulate HCI-controlled hardware using a number of sysctl(8) variables. SYSCTL VARIABLES
The following sysctls are currently implemented: hw.acpi.toshiba.force_fan Causes active cooling to be forcibly enabled ('1') or disabled ('0') regardless of the current temperature. hw.acpi.toshiba.video_output Sets the active display to use according to a bitwise OR of the following: 0 No display 1 LCD 2 CRT 4 TV-Out Only some systems (i.e., the Libretto L5) support video switching via this hardware-specific driver. Use the acpi_video(4) driver for generic video output support. hw.acpi.toshiba.lcd_brightness Makes the LCD backlight brighter or dimmer (higher values are brighter). hw.acpi.toshiba.lcd_backlight Turns the LCD backlight on and off. hw.acpi.toshiba.cpu_speed Sets the CPU speed to the specified speed. This provides functionality similar to the hw.acpi.cpu.throttle_state variable. Higher sysctl values mean lower CPU speeds. Defaults for these variables can be set in sysctl.conf(5), which is parsed at boot-time. LOADER TUNABLES
The hw.acpi.toshiba.enable_fn_keys tunable enables or disables the function keys on the keyboard. Function keys are enabled by default. This behaviour can be changed at the loader(8) prompt or in loader.conf(5). SEE ALSO
acpi(4), acpi_video(4), loader.conf(5), sysctl.conf(5), sysctl(8) HISTORY
The acpi_toshiba driver first appeared in FreeBSD 5.1. AUTHORS
The acpi_toshiba driver was written by Hiroyuki Aizu <aizu@navi.org>. This manual page was written by Philip Paeps <philip@FreeBSD.org>. BSD
February 19, 2004 BSD

Featured Tech Videos