[ubuntu] Unity and LXDE together, ,monitor power save, switching users issues

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http://ubuntuforums.org – Hello, Although I have no problem with Unity and want to continue using it, my wife is not a fan. So I installed LXDE on our shared desktop and set her session to use it. We usually both remain logged in and switch between the sessions. I have noticed that when my wife is logged in and leaves the computer for a while the monitor is never put in power save mode. Any ideas on how to fix this? Switching users from LXDE to Unity (i.e. her to me) usually results is a blinking cursor screen and I resort to using Ctrl-Alt-F7 to find my session. Going the other way works. So this is not (Hardware)