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Re: XPS 9570 + 4K external monitor - not working correctly through HDMI !

I've re-installed the OS. The problem didn't completely disappear, but it started happening less often and mostly in the middle of the working session. Interestingly, before the OS reinstall, whenever I switched on "Play HDR games and apps" while the laptop is running 4k@60Hz, the external monitory would stop displaying a picture. After the reinstall, the option began to work properly! Alas, for some reason, it has returned to its previous behavior; also, flickering screen started to happen more often....

I also tried replacing the monitor with brand new 27UL650, made no difference.

 

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