Hi,
I have the almost same problem, and I might be able to help you.
I have two identical qhd 24" lenovo p24h-10 screens. Both are connected to the d6000. However, one is connected with displayPort and the other via HDMI.
The screen connected over HDMI can show HIDPI resolutions while the other can't. And that pisses me off. (please, someone know why, help me)
But try to connect your screen with the HDMI port and you will (probably) unlock the HIDPI setting.
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