Dell WD15 Monitor Dock 4K with 180W Adapter, USB-C, (450-AEUO, 7FJ4J, 4W2HW)
About this deal
If only one monitor is shown, while the other is not, go to the Intel Graphics Control Panel, and under Multiple Displays, select the output for the second monitor.
The alternative is to use just one display at 4K with the HDMI cable. In this setup, we had similar experiences with typing and video watching.
Dell WD15 Docking Station Specs
Open the Intel HD Graphics Control Panel and go to the Multiple Displays control to set the display to the extended mode. I played some 4K video on the display while taking the 10fastfingers.com typing test on the TV, and found that performance didn't stutter at all. The video was smooth, and I managed to type at my average rate of 100 wpm with a 2 percent error rate, and experienced no lag.
Kaby Lake computers with USB Type-C DisplayPort only (non-ThunderBolt) connections using WD15 or DS1000 may have blanking external video If none of the following articles resolved your issue, there is a new resolution in the following section of this article: