10-02-2017 10:32 PM
The old docks (mini series 3) had a version with two passthrough DisplayPort
I am reading the Ultra dock is a single DisplayPort ran through an MST hub? What ? Now that even IGP supports three displays there is no way to actually use all of the video bandwidth available?
10-03-2017 09:02 AM
Can you please post the source of what you have read?
It looks to me that the "Thinkpad Ultra Dock 90W and 135W" has two DisplayPort ports on the back.
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10-03-2017 09:26 AM - edited 10-03-2017 09:36 AM
I read https://support.lenovo.com/ca/en/solutions/pd029622 Pay particular attention to the 3840 x 2160 @30Hz max when two DP monitors are connected vs 3840 x 2160 @60Hz when only one is. That screams the bandwidth of one signal is split into two, doesn't it?
There are a multitude of blog posts reporting the presence of an MST hub in the Ultra dock (and the problems this caused especially under Linux with originally missing / then spotty MST support):