Difference between screen saving in F11 and F12

[Brian Wood]

With F11 the screen saver would gradually (fade in), but with F12 it
happens suddenly.  I would like to have it fade in gradually again
on F12.  I've looked at the screen saver preferences but didn't
see a way to control that.  How can I make it behave the way I
want?  TIA

-- 
Brian Wood
http://www.webEbenezer.net
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