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Old computers were using CRT monitors and when an image was continuously displayed on the screen, it became marked. So, screensaver where invented to avoid screen burn-in.
Laptops and modern computers almost all uses LCD display now and, AFAIK, they are not affected by this effect.
So, should I completely deactivate this feature and use power management instead or I am wrong?
1If you know you're going to leave your computer for a while, switch off the LCD yourself will safe a little more energy. – Alvin Wong – 2012-09-28T15:01:12.030