Lenovo ThinkVision X1 display and MacBook (retina)

Today I took delivery of a new Lenovo ThinkVision X1 display. I specifically chose this display for my MacBook because it support USB-C; finally I can get rid of the Apple USB-C dongle and run everything from a single cable as nature intended. However, while the monitor works just fine with an HDMI cable (not 4K of course), I cannot get my Macbook to recognize it when I connect just using the USB-C cable. It does see the USB hub in the monitor, but not the display part. Does anyone have any experience getting this monitor working? I've tried both Apple USB-C that came with the Macbook as well as the USB-C cable shipped by Lenovo.

Thanks

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And with my third usb-c cable, I have it working.

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