I have the same problem with my HP S270n display. I have 2 monitors connected (1 HP S270n in 4K resolution with Displayport & 1 1080p resolution monitor with HDMI). But it says that 4K is not suppor...
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I have the same problem with my HP S270n display. I have 2 monitors connected (1 HP S270n in 4K resolution with Displayport & 1 1080p resolution monitor with HDMI). But it says that 4K is not supported by my hardware... Any idea why?