05-15-2011
That's not generally a Windows feature, usually that's part of the laptop hardware itself.
The fn-keys though, may not work properly if your kernel doesn't support them. Sometimes the kernel has specific fixes for specific models.
Asus makes lots of laptops. You might as well go looking for parts for a "Ford" as look for fixes for an "Asus". What is it?
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LEARN ABOUT DEBIAN
acpi_asus
ACPI_ASUS(4) BSD/i386 Kernel Interfaces Manual ACPI_ASUS(4)
NAME
acpi_asus -- Asus Laptop Extras
SYNOPSIS
To compile this driver into the kernel, place the following line in your kernel configuration file:
device acpi_asus
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
acpi_asus_load="YES"
DESCRIPTION
The acpi_asus driver provides support for the extra ACPI-controlled gadgets, such as hotkeys and leds, found on recent Asus (and Medion) lap-
tops. It allows one to use the sysctl(8) interface to manipulate the brightness of the LCD panel and the display output state. Hotkey
events are passed to devd(8) for easy handling in userspace with the default configuration in /etc/devd/asus.conf.
Currently, the following Asus laptops are fully supported:
xxN
A1x
A2x
A3N
A4D
A6VM
D1x
J1x
L2B
L2D
L2E
L3C
L3D
L3H
L4E
L4R
L5x
L8x
M1A
M2E
M6N
M6R
S1x
S2x
V6V
W5A
Eee PC
Additionally, acpi_asus also supports the Asus-compatible ATK0100 interface found in Samsung P30/P35 laptops.
SYSCTL VARIABLES
The following sysctls are currently implemented:
hw.acpi.asus.lcd_brightness
Makes the LCD backlight brighter or dimmer (higher values are brighter).
hw.acpi.asus.lcd_backlight
Turns the LCD backlight on or off.
hw.acpi.asus.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
Some models also support video switching via the generic acpi_video(4) driver. Most models do not, however.
Defaults for these variables can be set in sysctl.conf(5), which is parsed at boot-time.
SEE ALSO
acpi(4), acpi_video(4), sysctl.conf(5), sysctl(8)
The acpi4asus Project, http://sourceforge.net/projects/acpi4asus/.
HISTORY
The acpi_asus driver first appeared in FreeBSD 5.3.
AUTHORS
The acpi_asus driver and this manual page were written by Philip Paeps <philip@FreeBSD.org>.
Inspiration came from the acpi4asus project started by Julien Lerouge which maintains a driver implementing this functionality in the Linux
kernel.
BSD
December 17, 2008 BSD