As a temporary patch, you can try the following:
- Create a file (any name) under /etc/pm/power.d with the following
content:
# Brightness adjustment
case $1 in
true)
# 20% screen brightness on battery
echo 2 > /sys/class/backlight/acpi_video0/brightness
;;
false)
# 80% screen brightness on AC
echo 8 > /sys/class/backlight/acpi_video0/brightness
;;
esac
exit 0
- Make it executable "chmod +x myscript" assuming "myscript" is the name of
your file.
Of course, you will need to reboot. This will adjust the brightness at
20 % when on battery and 80% when on AC power.
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https://bugs.launchpad.net/bugs/923940
Title:
Ubuntu 12.04 LTS set max lcd brightness on every boot
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https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/923940/+subscriptions
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