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7577 screen shifts when connected to external monitor

My 7577 screen shifts on the laptop screen when connected to an external monitor. I'm almost certain it only acts up when set to 1080p instead of 4k on laptop, but in 4k there's worse issues like high cpu usage causing sound and lag problems. External monitor is 1080p connected through hdmi. I understand this might be an Optimus graphics switching problem?

gif of screen shifting can be seen here https://www.reddit.com/r/Dell/comments/dwn0r3/7577_screen_shifts_when_connected_to_external/

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