Add the following script to /etc/pm/power.d
----------
#!/bin/bash
case $1 in
true)
echo "Enable screen power saving"
echo 5 >
/sys/class/backlight/acpi_video0/device/backlight/acpi_video0/brightness
;;
false)
echo "Disable screen power saving"
echo 10 >
/sys/class/backlight/acpi_video0/device/backlight/acpi_video0/brightness
;;
esac
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https://bugs.launchpad.net/bugs/1184164
Title:
backlight does not dim on AC adapter unplug
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https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/1184164/+subscriptions
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