By setting the following GSettings keys, you can configure the drop in
the brightness level, and set brightness level and idle time.
Set the drop in the brightness level
To set the drop in the brightness level when the
device has been idle for some time, create a local database for
machine-wide settings in /etc/dconf/db/local.d/00-power,
as in the following example:
[org/gnome/settings-daemon/plugins/power]
idle-dim=true
Set brightness level
To change the brightness level, create a local database for
machine-wide settings in /etc/dconf/db/local.d/00-power,
as in the following example, and replace 30 with the integer value
you want to use:
[org/gnome/settings-daemon/plugins/power]
idle-brightness=30
Set idle time
To set the idle time after which the screen must be blanked and the
default screensaver displayed, create a local database for
machine-wide settings in /etc/dconf/db/local.d/00-session,
as in the following example, and replace 900 with the integer value
you want to use:
[org/gnome/desktop/session]
idle-delay=900
Incorporate your changes into the system databases by running the
dconf update command as root.
You can also
lock down the above
settings to prevent users from changing them.
