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4 Posts

12-13-2019

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Thinkpad p52s with Thunderbolt 3 dock - dual monitor not working properly

2019-12-13, 22:38 PM

Hi everyone,

 

I have a Thinkpad p52s hooked up to a newly bought ThinkPad Thunderbolt 3 Dock Gen 2 135W (40AN0135US).

 

I recently also purched a second external monitor, and want to operate them through the dock now (with laptop closed)

Both monitors are Dell U2518D, and they have a resolution of 2560 x 1440.

 

However, the moment I plug in both monitors, one will only be available at a resolution of 1920 x 1080.

 

What I've tried so far:

  • updated Windows 10
  • updated all p52s drivers
  • switched cables from HDMI to mDP
  • tried all four monitor plugs in the dock
  • tried another U2518D monitor (we have more at the office)
  • My laptop screen is only HD so I can't compare it, but when I open the lid I simply have one more HD screen

 

To no avail. One of the screens will always go back to a generic HD display with 30Hz. I'm no expert but I was convinced this shouldn't be a problem with the laptop and the dock?

 

I have the Intel UHD Graphics 620 driver version 26.20.100.6951 installed. I don't know why nVidia does not have any settings about the monitors but again, I'm no expert, and I didn't find anyone else having the same problem.

 

I attached screenshot to show how this monitor is being displayed.

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4 Posts

12-13-2019

CA

11 Signins

66 Page Views

  • Posts: 4
  • Registered: ‎12-13-2019
  • Location: CA
  • Views: 66
  • Message 2 of 4

Re: Thinkpad p52s with Thunderbolt 3 dock - dual monitor not working properly

2019-12-14, 1:10 AM
I tried daisy chaining them but they only seem to mirror each other. Could not get them to extend the monitors... even with "MST" on, even after updating the monitor firmware to the same one.
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4 Posts

12-13-2019

CA

11 Signins

66 Page Views

  • Posts: 4
  • Registered: ‎12-13-2019
  • Location: CA
  • Views: 66
  • Message 3 of 4

Re: Thinkpad p52s with Thunderbolt 3 dock - dual monitor not working properly

2019-12-14, 3:21 AM
Another update, I tried to run a FW update on the TBT gen 3 dock that I'm using, and the program says "dock not found".

It's getting really annoying!
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4 Posts

12-13-2019

CA

11 Signins

66 Page Views

  • Posts: 4
  • Registered: ‎12-13-2019
  • Location: CA
  • Views: 66
  • Message 4 of 4

Re: Thinkpad p52s with Thunderbolt 3 dock - dual monitor not working properly

2019-12-16, 22:00 PM

Has anyone got a clue what might cause these problems?

 

Or do I have the wrong laptop to run 2x QHD displays? I would have not expected that.

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