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25 Posts

08-13-2019

Finland

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Trouble with dual monitor w/ Thunderbolt 3 Dock Gen 2

2021-07-06, 21:30 PM

I've got a Thinkpad Thunderbolt 3 Dock Gen 2 plugged into my X1 Carbon Gen 7 with a pair of new Samsung 28" UHD monitors as a dual monitor set up (actually triple monitor if I include my X1C display). Is it normal that I won't be able to get UHD resolution (3840 x 2160) on both Samsung monitors at the same time? It seems that I only have the option to change 1 of them to UHD resolution while the max on the other is 1920 x 1080. Or am I doing something wrong?

 

My connections are like this:

  • I've got the Thunderbolt connector connected from my X1C to the rear Thunderbolt port of the dock.

  • I've got an HDMI cable going from monitor 1's HDMI 1 input into the first HDMI input of the dock

  • I've got an HDMI cable going from monitor 2's HDMI 2 input into the second HDMI input of the dock

 

Even if I choose "Disconnect this display" of my X1 Carbon's 14" screen from my Windows 10 Display settings window, there's still no option to change the second monitor's resolution to UHD resolution. Is this as designed or am I doing something wrong? I was thinking maybe I'm not able to use two HDMI inputs and instead need to use a display port with one of them?

 

I should mention, I noticed if I remove the HDMI cable from the dock and instead put into my X1C, I have the option to change to UHD resolution to both my X1C display and the 1st Samsung monitor.

 

I was looking at this Lenovo support page but it's a typical Lenovo mess and I can't make sense of it. https://support.lenovo.com/fi/en/solutions/pd029622-display-and-video-output-configurations-docking-stations#Thunderbolt%203%20Workstation%20Dock%20Gen%202

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5597 Posts

08-02-2018

Philippines

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Re:Trouble with dual monitor w/ Thunderbolt 3 Dock Gen 2

2021-07-07, 10:47 AM

Hello johnny770!


Greetings

 


According to the product spreadsheet, the laptop can connect up to 2 external monitors with the main screen on through the HDMI® (up to 4K @ 24Hz) and Thunderbolt™(up to 5K @ 60Hz) and you can check it here: https://psref.lenovo.com/Product/ThinkPad/ThinkPad_X1_Carbon_7th_Gen

 

Try installing the dock driver first and restart the computer. Then install the firmware and you can get it from this link: https://pcsupport.lenovo.com/us/en/solutions/pd500265

 

Let us know how it goes.

 


Jwes_Lenovo



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25 Posts

08-13-2019

Finland

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Re:Trouble with dual monitor w/ Thunderbolt 3 Dock Gen 2

2021-07-07, 10:59 AM

I have the latest Thunderbolt 3 Dock Gen 2 firmware, got it from the Lenovo Vantage.

 

Is there a restriction where I can't use both HDMI ports and get the UHD resolution (3840 x 2160) to both monitors? In other words, to get the UHD resolution to both monitors, do I need to connect one of the monitors to an HDMI port of the Dock and the second monitor to the DisplayPort of the Dock?

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5597 Posts

08-02-2018

Philippines

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Re:Trouble with dual monitor w/ Thunderbolt 3 Dock Gen 2

2021-07-07, 21:37 PM

You would need to follow the suggested setup on the product sheet above to match those for your dock as shown here.
https://support.lenovo.com/us/en/solutions/pd029622


 Here we expect that you like it on extended dual-mode and not a mirror.

 

 

 

 

Jwes_Lenovo



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25 Posts

08-13-2019

Finland

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  • Message 5 of 6

Re:Trouble with dual monitor w/ Thunderbolt 3 Dock Gen 2

2021-07-07, 22:03 PM

Yes that's the same link I shared in the original post. Makes no sense and is not clear. 

 

Again ... Monitor #1 I can change to any resolution all the way up to 3840 x 2160 while Monitor #2 I can only go up to 1920 x 1080. Here are the details of my setup again:

 

  • I have the ThinkPad Thunderbolt 3 Dock Gen 2 (40AN) 
  • I have 2 external monitors 28" UHD Monitor (U28R55)
  • Each monitor has a DisplayPort and an HDMI port
  • I am only using the HDMI ports from each monitor to the 2 HDMI ports of the dock
  • I am using the monitors as extended to be a proper dual monitor set up, not a mirror

 

I think my original question is quite clear and a reasonable question. Maybe someone else internally knows the answer.

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5580 Posts

04-25-2008

United States of America

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Re:Trouble with dual monitor w/ Thunderbolt 3 Dock Gen 2

2021-07-07, 23:26 PM
Have you tried the monitors at 30Hz refresh rate?
USB-C: Just cos it fits don't mean it works.
I don't work for Lenovo. I'm a crazy volunteer!
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