Showing results for 
Search instead for 
Do you mean 
Reply
chx
Token Ring
Posts: 80
Registered: ‎09-08-2009
Location: CA
Message 1 of 3 (261 Views)

The new docks have degraded ??

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? 

Guru
Posts: 1,605
Registered: ‎02-27-2012
Location: US
Message 2 of 3 (169 Views)

Re: The new docks have degraded ??

Hi.

 

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.

 

Regards






Martín Itúrbide
OS2World.com NewsMaster
"Don't Panic"
Wil Wheaton
Remember: Your Friend Wil Declares....
Please click "Kudos" for Ego Boost !!

Highlighted
chx
Token Ring
Posts: 80
Registered: ‎09-08-2009
Location: CA
Message 3 of 3 (165 Views)

Re: The new docks have degraded ??

[ Edited ]

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):


https://cweiske.de/tagebuch/thinkpad-ultradock-screens.htm
https://www.reddit.com/r/thinkpad/comments/50i0h0/w540_ultra_dock_3_display_woes/d7491fq/
https://www.turbocache3000.de/post/2015-06-03-the-tale-of-the-three-little-monitors-and-the-evil-len...

 

Top kudoed Authors