.TH ADJBACKLIGHT 1 ADJBACKLIGHT
.SH NAME
adjbacklight - Convenient method for adjusting the backlight on your portable computer
.SH SYNOPSIS
.B adjbacklight
[-g | -s
.RB [ + | - ]\fIlevel\fP[ % | %% ]]
[-a |
.IR device \ ...]
.SH DESCRIPTION
.B adjbacklight
can be used to fetch or set the backlight non-interactively.
If these feature is not used, it starts a interactive user
interface in the terminal. However, if stdin is not a terminal,
every line from stdin is parsed as a
.B -s
argument.
.P
.B adjbacklight
installs with the set-uid bit set, to enable any user in the
video group to change the backlight on the computer.
.P
.B adjbacklight
was originally designed for small netbooks that are not running
.BR X .
However, it is still suitable for desktop computers and can
be used inside
.BR X .
In fact it seems to work for all machines with backlight, which
is not true for
.BR xbacklight (1).
.B adjbacklight
uses
.IR /sys/class/backlight .
.B adjbacklight
as been retrofitted to be convenient for use inside
.B X
on desktop computers, with commands that lets it be used
non-interactively with hotkeys set up in
.BR xbindkeys (1).
.SH OPTIONS
.TP
.BR \-a
Run for all devices, including ACPI devices.
.TP
.BR \-g
Get average brightness on devices.
.TP
.BR -s \ \fIlevel\fP
Set brightness on devices by actual value.
.TP
.BR -s\ + \fIlevel\fP
Increase brightness on devices by actual value.
.TP
.BR -s\ - \fIlevel\fP
Decrease brightness on devices by actual value.
.TP
.BR -s \ \fIlevel\fP%
Set brightness on devices by percentage-points.
.TP
.BR -s\ + \fIlevel\fP%
Increase brightness on devices by percentage-points.
.TP
.BR -s\ - \fIlevel\fP%
Decrease brightness on devices by percentage-points.
.TP
.BR -s \ \fIlevel\fP%%
Set brightness on devices by percentage.
.TP
.BR -s\ + \fIlevel\fP%%
Increase brightness on devices by percentage.
.TP
.BR -s\ - \fIlevel\fP%%
Decrease brightness on devices by percentage.
.SH KEYBOARD
.TP
.BR left ,\  down
Darken the screen.
.TP
.BR right ,\  up
Brighten the screen.
.TP
.BR q ,\  enter ,\  C-d
Continue to next controller, or if at last, quit.
.SH "SEE ALSO"
.BR xbindkeys (1),
.BR xbacklight (1)
.SH AUTHORS
Mattias Andrée
.RI < maandree@kth.se >