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John_Galt
Fanfold Paper
Posts: 9
Registered: ‎08-25-2015
Location: US
Views: 2,147
Message 1 of 6

X1 Carbon 3rd gen with two external 2560x1440 monitors?

I have a 20BS X1 Carbon i7 with the internal 2560x1440 display and the OneLink Pro dock. I also have two external Dell 2560x1440 monitors; these monitors have three ports: Display Port, HDMI and VGA.

 

I'm trying to figure out how to get everything connected so I can run all three displays at 2560x1440.

 

I cannot use the DVI port on the OneLink Pro dock because the maximum resolution on the dock's DVI port is 1920x1200https://support.lenovo.com/us/en/documents/pd029981

 

At first, I ran one external monitor to the DisplayPort port on the dock and the other monitor to the HDMI port on the laptop. The monitor connected to the dock worked at 2560x1440, but the montior on the HDMI port did not work at all. If I disconnect the dock from the laptop, then the montior connected to the laptop via HDMI turns on immediately work runs at 2560x1440, when I reconnect the dock, it turns off.

 

Next, I took the monitor that was connected to the HDMI port, and plugged it into the mini-DP port on the laptop. In this mode, the monitor connected to the dock runs at 2560x1440 and the monitor connected to the laptop's mini-DP port runs at 1920x1080.

 

Question: If I connect one monitor to the laptop's HDMI port and another to the laptop's mini-DP port, will I be able to run both of them at 2560x1440 along with the laptop's built in screen? I'd like to know before I buy another adapter.

 

John_Galt
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Registered: ‎08-25-2015
Location: US
Views: 2,097
Message 2 of 6

Re: X1 Carbon 3rd gen with two external 2560x1440 monitors?

After more experimentation, I've determined that any combination of plugging the two monitors into any combination of the OneLInk Pro DP port, and the laptop's HDMI and miniDP ports, I always end up with either one monitor not working or running at 1920x1080. 

 

I cannot find a solution to get both monitors running at 2560x1440.

 

Does anyone have any other idea\s?

 

I'm running Windows 8.1 with all the latest updates and the latest Intel graphics driver.

BB-8
What's DOS?
Posts: 2
Registered: ‎02-10-2016
Location: Magyarország
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Message 3 of 6

Re: X1 Carbon 3rd gen with two external 2560x1440 monitors?

John_Galt
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Posts: 9
Registered: ‎08-25-2015
Location: US
Views: 2,014
Message 4 of 6

Re: X1 Carbon 3rd gen with two external 2560x1440 monitors?

The link below suggests that my laptop should support both monitors at 2560x1440, why can't I make it work?

 

https://support.lenovo.com/us/en/documents/pd100511

 

Max resolution:

  • 3840x2160 (Mini DisplayPort)@60Hz
  • 4096x2304 (HDMI)@24Hz
John_Galt
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Registered: ‎08-25-2015
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Message 5 of 6

Re: X1 Carbon 3rd gen with two external 2560x1440 monitors?

That might work, but the specs on the laptop say that it should work natively, without extra hardware.

John_Galt
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Posts: 9
Registered: ‎08-25-2015
Location: US
Views: 1,891
Message 6 of 6

Re: X1 Carbon 3rd gen with two external 2560x1440 monitors?

I just did a clean install of Windows 10, loaded all the latest updates and Lenovo drivers, and still have the same problem.

 

Any ideas?

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