Ubuntu – Set different blank screen timeouts when on battery or ac

This is how I do it for v12.10

Go to the dconf Editor > settings daemon > plugins > power (schema: org.gnome.settings-daemon.plugins.power)

Make sure the boxes for "idle-dim-ac" and "idle-dim-battery" are both unchecked. That will set both booleans to false. If that doesn't work, there is a work-around in one of the launchpad bug reports: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1072531/comments/19

If you want to turn all power savings features off completely all at once, uncheck the box at "active" in that power section. IMHO, not a good idea, but you said you were wondering how to do that also.

If you look at the "Power" tab in System Settings, you have the option to choose what happens when the battery reaches a critically low level. You can, with standard Ubuntu, make it power off when critically low. If you have hibernation enabled (Check out this link for instructions: How to enable hibernation?), you can also make the computer hibernate. If in doubt about the difference between suspend and hibernate, look at this: http://ubuntuforums.org/showthread.php?t=1660436

I hope that I have been of service.

-Mario3D13