04-08-2014 04:25 PM
I have 3 Dell U2414H monitors that support DisplayPort 1.2 daisy chaining. I purchased the T440s with docking station. The laptop arrived before the dock. It has Windows 8.1 Pro x64 running. I setup the monitors to daisy chain off of the T440s miniDP port. I got exactly as I should. 3 separate monitors. I could maximize windows inside a monitor and they'd maximize to their monitor. I could drag windows between monitors. Everything is working.
When the dock came in (today) I left the monitors daisy chained. I did change out one cable (that I know is working) so that the DP input would attach to the dock's DP output. I am not getting a picture on the monitors. If I use just one monitor, and turn off DP1.2 (in the monitor's menu), I get a picture on one monitor. Do these docks not support daisy chaining? I've verified that I'm on FW 2.17 for the dock. I also want to submit a support ticket with Lenovo, I just don't know how to do that yet. Thanks!
Solved! Go to Solution.
04-28-2014 01:15 PM
I'm glad to know I'm not the only one. I contacted Lenovo regarding this issue. The "tech" on the phone gave me 2 different answers. Both answers involved sending me a new docking station. I received it last week, and set it up today. Still no joy. This is not surprising. I couldn't even get the dock to see _any_ monitor on the 2 DPs.
So, my choices are to continue the way I am (mDP out of laptop to 1st monitor in the chain), or to hook each monitor up individually to the dock (DP, DP, HDMI). I'm not sure what I'll do yet. I'm also having issues with the monitors even being recognized on boot of the laptop. Sometimes, I have to un/plug them in just to get the laptop to see them. This however, appears to be an issue with this model Dell monitor and DP 1.2 MST Daisy Chaining and has several threads open on the Dell forums.
04-28-2014 01:17 PM
Not sure if you have seen this: http://support.lenovo.com/en_US/detail.page?DocID=HT081248
My dock had the same firmware, updated it anyway, but still didn't work.
04-28-2014 01:19 PM
All docks after a certain time (Jan/Feb?) will have 2.17 FW installed. It fixed the monitor sleep issue, but I have a feeling that the DP hub in the docking station isn't DP 1.2 aware. That's kind of bogus considering it's a brand new dock for a brand new set of laptops that run Haswell and with their integrated graphics, support DP 1.2.
04-28-2014 01:43 PM
According to this, they should support DP 1.2
04-28-2014 02:01 PM
We are getting the Pro Dock: 40A10090US
Looks like you are getting the Ultra Dock: http://support.lenovo.com/de_DE/product-and-parts/detail.page?&DocID=PD028011