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6 Posts

09-25-2018

Hungary

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USB-C/Thunderbolt to DisplayPort - 2k@60 not working

2021-04-09, 12:49 PM

I have

  • a 20QV (Thinkpad X1 Extreme gen 2.)
  • a Dell U2711 legacy, but 2k monitor with 60hz refresh rate
  • Logilink USB-C -> DisplayPort cable (4k/2k@60hz)
  • an up-to-date Ubuntu 20.10
  • and I use the discrete nVidia card (GeForce GTX 1650 Mobile) as primary card w/ 3rdparty driver

I know that, the U2711 has some limitations w/ its ports. It can only do the 2k@60 when you connect it through DisplayPort or 2xDVI. Before the X1 Extreme, I used to use this monitor through miniDP -> DP port w/ a Thinkpad P50 and nVidia also, and it worked like charm. :)

 

If I connect the X1 to the monitor w/ HDMi, it is working properly w/ 1080p@60 resolution.

BUT: The problem is, when I connect it to USB-C -> DP it is not working. The OS can see the monitor and I can change resolutions and everything as expected but meanwhile that, the U2711 has a black screen.  If I downgrade the resolution to 1080p it is only working w/ 28hz (!!) refresh rate. Above the 28hz or 1080p it shows black screen again.

What can I do? What is the solution for this problem? :(

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6 Posts

09-25-2018

Hungary

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  • Posts: 6
  • Registered: ‎09-25-2018
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Re:USB-C/Thunderbolt to DisplayPort - 2k@60 not working

2021-04-11, 13:09 PM

Sadly, the problem is w/ the U2711. I bought a new monitor and it is working in 2k@144 properly through the usb-c -> DP.

Sincerely,
s7

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2012 Posts

01-08-2021

Philippines

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Re:USB-C/Thunderbolt to DisplayPort - 2k@60 not working

2021-04-09, 13:18 PM

Hello system7,

 


Greetings

Have you tried to reset the U2711 monitor? Chances are it's running the settings based on the previous configured computer which is the P50.

Kindly try it and update us how it goes

 

Regards, 
Lorenzo_Lenovo



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6 Posts

09-25-2018

Hungary

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  • Posts: 6
  • Registered: ‎09-25-2018
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  • Message 3 of 5

Re:USB-C/Thunderbolt to DisplayPort - 2k@60 not working

2021-04-09, 14:36 PM

Hello Lorenzo,

 

Yes, I have. I factory reseted the monitor and after that I had the same result. I have done this list:

  1. factory reset on monitor
  2. restart the computer
  3. in BIOS enable/disable the hybrid/discrete graphics mode
  4. in BIOS enable/disable the secure boot

I will try to use a dedicated lenovo adapter (one of my friend have one) w/ another DP cable but I think, the problem is not the cable. So it won't work.

 

Regards,
s7

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6 Posts

09-25-2018

Hungary

6 Signins

92 Page Views

  • Posts: 6
  • Registered: ‎09-25-2018
  • Location: Hungary
  • Views: 92
  • Message 4 of 5

Re:USB-C/Thunderbolt to DisplayPort - 2k@60 not working

2021-04-11, 13:09 PM

Sadly, the problem is w/ the U2711. I bought a new monitor and it is working in 2k@144 properly through the usb-c -> DP.

Sincerely,
s7

--
It is our choices that define us.

0 person found this solution to be helpful.

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2012 Posts

01-08-2021

Philippines

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  • Posts: 2012
  • Registered: ‎01-08-2021
  • Location: Philippines
  • Views: 10195
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Re:USB-C/Thunderbolt to DisplayPort - 2k@60 not working

2021-04-23, 20:32 PM

Thank you for letting us know.
Take care
 
 
Best regards,
Lorenzo_Lenovo



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