Second 4k monitor low refresh rate (30Hz)

I have a plugable UD-6950PDH connected to a Macbook Pro 2.6GHz Intel I7 (with AMD Radeon Pro 5300M GPU). When I have two 4K displays connected (one in vertical orientation), the second vertical display only supports a max of 30Hz refresh rate at 2160x3840. If I connect the second display directly over USB to Displayport, it runs at 60Hz. This plugable hub is specified to support two 4K monitors at 60Hz. What’s are the potential problems? (I’m running displaylink manager 1.8.1 build 63.180).


Hi Erik,

Thank you for contacting Plugable! I am sorry to hear that your UD-6950PDH docking station is not functioning as expected, and would be happy to provide additional support.

To help diagnose the issue, may I ask you to please keep the device connected to your laptop with everything still attached (even if not working as expected) and send us the output of our diagnostic utility PlugDebug? →

Once you have the logs, simply send an email to with the subject line of “Ticket 402515” so that we can prioritize that case and match it to this inquiry.

If you could provide your Amazon Order ID (or other proof of purchase) associated with your Plugable device, I would be happy to check on your warranty status as well.

Thank you for giving us the chance to help!

Plugable Technologies

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