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Ok so it seems that the key in org.gnome.settings-daemon.plugins.power idle-dim-time is gone in the new Ubuntu version. Since the old method Increase screen idle dim timeout doesn't work anymore are there any other ways to change this?

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up vote 5 down vote accepted

It looks like the setting for idle dim time has changed schemas. Use org.gnome.desktop.session idle-delay:

gsettings set org.gnome.desktop.session idle-delay <value>

For the future, a great way to find a setting is to pipe list-schemas or list-recursively to grep. That's how I figured this one out:

gsettings list-recursively | grep idle

Hope that helped!

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BTW, this is equivalent to the "Turn screen off when inactive for # minutes" in Brightness & Lock, not exactly the time for "Dim screen to save power", it took about 60 second to dim the screen (brightness turned down to around 30%) when running on battery with 14.04, and I didn't see any schema that is related to this dim time stuff. – P.-H. Lin Sep 17 '15 at 4:18

this command helped in my case:

gsettings set org.gnome.settings-daemon.plugins.power idle-brightness 180
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Apparently Gnome developers decided that user does not need any way to customize idle dim time and removed this option in this commit. After this patch, dim-idle-time was computed based on idle-delay (see @ruby answer) by dividing it by three. Few days later they decided that dividing by 3 is not good and changed this factor to 4/5 in this commit. Even though those arbitrary divider proved to be, well, arbitrary, they didn't restore any possibility to change this by user.

Note that Ubuntu is now using unity-settings-daemon which is a fork of gnome-settings-daemon with exactly the same code regarding screen dimming.

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