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Full Discussion: Brightness adjustment
Operating Systems Linux Ubuntu Brightness adjustment Post 302439692 by verdepollo on Friday 23rd of July 2010 10:06:16 AM
Old 07-23-2010
It *might* be different in your system, but this works just fine in mine.

Code:
echo "80" > /proc/acpi/video/VGA/lcd/brightness

Change "80" to some reasonable number.

Smilie
 

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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
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