The TV is capable of running at full 3840x2160 at 60Hz when connected directly to the laptop's HDMI port, but when connected to the dock even by itself, the system simply won't enable it at all. The problem is that the Iris Xe graphics on the new laptop don't do this. The computer automatically adjusted and only allowed the TV to be set up to 1920x1080, just like the monitor.
Due to bandwidth limitations of DisplayPort and HBR2, the TV only ran at 1080p, but this was fine. With his previous laptop, a Latitude 5580 with Intel HD 620 graphics, he was able to connect to a 1080p monitor using DisplayPort and a 4K TV using HDMI. One of them has a WD19 docking station which his monitors connect to. They have Core i5-1135G7 processors with Iris Xe graphics. I work tech support for a school district, and we're in the process of upgrading our principals' laptops to Latitude 3520s.
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