Quote:
Originally Posted by maiux
Thanks for your reply, but changing refresh rate didn't solve the problem.
Instead I solved the problem playing with brightness controls: put to 0%, then to 100%, after that to desired brightness level.
The problem seems to have disappeared... And, as Murphy could say: "If it works, don't ask yourself why" 
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Very happy to hear you found a solution that worked. Maybe there was some corruption in the memory that you cleared by resetting the brightness level? (I'm just taking a wild guess.)