Two HP Z27 4K Displays with HP 2018 15" Spectre and HP Thunderbolt 2G Dock Only Half Working

[teck13]

I have searched this community and found simialr questions and solutions but none seem to quite apply.  I have a 2018 Spectre X360 15" with 16 Gb of memory and a Nvidia MX 150 dedicated 4GB graphics card.  I am trying to support two HP Z27 Displays at 4K as well as leaving on the laptop screen.  One external monitor is displaying beautifully at 3840  x 2160 (4K) but the other Z27 monitor I can not get to display beyond 1920 x 1080.   Everything seems to work OK at 1920 x 1080 but at 27" the image is very soft and fuzzy - I would like it to match the other external Z27 showing full 4K resolution.  The laptop screen is also displayiing at full UHD at 3840 x 2160. 

I am also using a HP G2 120W Thunderbolt Dock, with a USC connection between the laptop and the dock.  And two Display Port cables running from the dock to the two Z Displays.  I tried substituing the two Display Port cables wtih two USC cables (between the dock and two displays) but that was not any better.

I have contacted multiple support folks at HP commerical, consumer, Nividia and no one has an answer.  I thought may one of the geniuses here might have one.  Thanks ahead of time for any feedback or answers.  Appreciated.

[erico]

If you do not provide detailed information on your notebook it is close to impossible to halp you.

"2018 Spectre X360 15" is a non-specific description of a notebook withing a model category.

My 2018 product loan is an HP Spectre x360 - 15t-ch000 notebook with a ProdID of 2FW61AV.

All of that information is located on the bottom of the notebook in tiny print.

The HP Thunderbolt Dock 120W G2 is:

Compatible with HP Elite x2 1012 G1; HP Elite x2 1012 G2; HP Pro x2 612 G2; HP EliteBook Folio G1; HP EliteBook x360 1030 G2; HP EliteBook x360 1020 G2; HP EliteBook 1040 G4; HP EliteBook 800 G5; HP EliteBook 700 G5; HP ProBook 600 G4; HP ProBook 400 G5; ZBook 14u G5; ZBook 15u G5

I do not see any consumer level x360 notebooks in the list.

[teck13]

Good point, sorry I am a newby here.   Here are the details:

HP Spectre x360 Convertible

Model:  15-ch011nr

ProductID:  3MU06UA#ABA

[Huffer]

You have a 4K internal display and usually you can get the computer to drive 2 x 4K and then an FHD display. So I am betting if you close the laptop screen you will get 4K on both external monitors. The setup I have with a Zbook G3 using a Thunderbolt dock is 2 x 4K DP externals and then the laptop screen itself is a FHD 1920 x 1080. It is very hard to get the video bus to provide enough bandwidth to drive 3 x 4K displays.

You do have an extra USB-C port with alt-DP in addition to the Thunderbolt port where you have the dock plugged in. 

All you can really do is try to spread out the video bandwidth. You have the 2 externals going through the same channel i.e.the DP ports on the dock. Get a Thunderbolt to DP adapter and try plugging it into the extra port on the laptop or even the Thunderbolt port on the dock. Sometimes spreading it out like that will give enough extra video bandwidth to allow another 4K display. One of the employees in my office has a laptop with a QHD display and we have not had a lot of luck getting it to drive that plus 2 x 4Ks but it will drive an FHD plus 2 x 4Ks through a Tbolt dock. 

Good luck.