Extending the time Ubuntu 12.04 stays open without making the screen go dark

Don Parsons dfp10 at verizon.net
Thu Feb 12 18:54:34 UTC 2015

I would like to have the screen stay live longer than the present few 
minutes (or go dark for a short time and then open up again repeatedly 
and automatically). I find the present need to keep signing back inm 
when the screen goes dark, rather annoying.

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