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I am trying to connect my MBP 2017 to a Dell U2713HM with a USB-C to DisplayPort cable (Part No ELUCDP-01) made by Alogic.

When I plug in the cable to the USB-C port, the monitor will say there is 'No DisplayPort cable' and then show 'Entering power saving mode'.

The main monitor on the other hand will dim for a moment and the keyboard will become unresponsive for a moment.

Anyone know how I can fix the issue?

Error messages in log:

enter image description here

ColorSync: ColorSyncProfileCreateWithDisplayID failed to get profile for kColorSyncDisplayDeviceClass

It seems to me the monitor can be recognised by the MBP. Here is a screenshot of ColorSync:

enter image description here

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    The cable might be bad. Have you tried connecting the cable to the USB port first, then to the monitor? What happens when you power everything down, connect the usb cable, then power everything up, starting with the monitor first, then the MBP? – IconDaemon Oct 14 '17 at 10:57
  • It is purely a software issue. Please see my answer. – Anthony Kong Oct 15 '17 at 23:45
  • It still could be a cable issue - the clock sync of the DP signals could be the issue you are seeing. Which cable do you have? That company makes many. – Allan Oct 15 '17 at 23:55
  • 1m usb-c to displayport alogic.co/… – Anthony Kong Oct 15 '17 at 23:58
  • Never heard of that brand, but I have used this cable with good results. I say this because I have run across seeming good cables that failed spectacularly – Allan Oct 16 '17 at 0:25
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Upgrade to High Sierra (Version 10.13, build 17A405) allows the monitor to display again.

The picture quality is blurry. It is as if I am using the HDMI input.

It turns out there was issue with the Alogic cable.

At the end I purchased a new set of cables (Konix) and the problem is resolved.

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