Posted on 2014-02-14 19:58
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http://denis.doublebuffer.net/lablog/2012/11/19/fixing-the-screen-flickering-on-a-dell-inspiron-n5720-and-maybe-many-others/
A Dell Inspiron N5720 has a nVidia GT 630M and an Intel HD Graphics 4000. Let’s see what the Intel Graphics Control panel looks like. To open it, follow these instructions.
Select Advanced mode.
Go to the Power menu and change the power source to “On battery”. Now uncheck the little check box that says “Display Refresh Rate Switch”. Apply. OK. And you’re done.