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E7450 laggy mouse issue with high resolution external screen via HDMI


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Hi all, I have follow Jake_Lo's guide for E7450 and everything works perfectly.


The only issue is when I connected HDMI to external LED screen (4k),  the mouse feels delay or laggy if i choose any resolution higher than 720P.  the internal screen is 1366x768. there's no difference on mirror,  extend screen and lid closed.


is it hardware limit ? but I can't believe HD550 can't handle 1080P.

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