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RU7100 only working in 30Hz in 4K resolution when connected via Laptop

I have RU7100 55inch model. But when I connect my laptop via HDMI it seems laggy then I checked the refresh rate and it's 30Hz. But I can'y change it to 60Hz because it is not showing. When I change the resolution to lower one 60Hz is working. Any suggestion to fix the issue? I have tried connecting to all the HDMI ports, Game Mode on/off, Anynet on/off nothing seems to work.