Software: Apache/2.4.18 (Ubuntu). PHP/7.0.33-0ubuntu0.16.04.16 

uname -a: Linux digifus 3.13.0-57-generic #95-Ubuntu SMP Fri Jun 19 09:28:15 UTC 2015 x86_64 

uid=33(www-data) gid=33(www-data) groups=33(www-data) 

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/usr/share/doc/acpid/examples/   drwxr-xr-x
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Viewing file:     ac.sh (1.12 KB)      -rw-r--r--

#!/bin/sh
# /etc/acpid/ac.sh
# Detect loss of AC power and regaining of AC power, and take action
# appropriatly.

# On my laptop anyway, this script doesn't not get different parameters for
# loss of power and regained power. So, I have to use a separate program to
# tell what the adapter status is.

# This uses the spicctrl program for probing the sonypi device.
BACKLIGHT=$(spicctrl -B)

if on_ac_power; then
        # Now on AC power.

        # Tell longrun to go crazy.
        longrun -f performance
        longrun -s 0 100

        # Turn up the backlight unless it's up far enough.
        if [ "$BACKLIGHT" -lt 108 ]; then
                spicctrl -b 108
        fi
else
        # Now off AC power.

        # Tell longrun to be a miser.
        longrun -f economy
        longrun -s 0 50 # adjust to suite..

        # Don't allow the screen to be too bright, but don't turn the
        # backlight _up_ on removal, and don't turn it all the way down, as
        # that is unusable on my laptop in most conditions. Adjust to
        # taste.
        if [ "$BACKLIGHT" -gt 68 ]; then
                spicctrl -b 68
        fi
fi