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4 Posts

10-26-2020

Belgium

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T14s(intel) external monitor 4k @60Hz

2020-10-26, 11:47 AM

Hi,

 

I recently purchased a new T14S intel i7-10610U - 32GB laptop. The machine on its own runs great except when I connect an external 4k display.

 

I have an LG 27ud88-w. If I connect via USB-C or HDMI I experience lag if I run it at 4k since it's not allowing me to select 60Hz.

Both the monitor and laptop should support this but if I go to my list modes in my advanced display settings I cannot see the option. 

 

I checked my cables and they should support it.

 

I purchased the USB-C docking station and if I then connect the same display over Display port I have the same result.

 

When I change my resolution to QHD (2560x1440) it switches to 60Hz and then it runs great.

 

any suggestions?

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612 Posts

06-26-2016

Germany

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Re:T14s(intel) external monitor 4k @60Hz

2020-10-26, 15:18 PM

 

This is pretty normal and expected, if using an USB-C dock with a DisplayPort 1.2  system.

If you want to use a dock, when you'll need to get a thunderbolt 3 dock. 

 

If you connect monitor via an USB-C cable then the same limitation might happen like connecting an USB-C dock. Only 4K@30 HZ is possible, because the monitor seems to have built-in USB-3 ports/hub.

Most monitors have an option to configure monitor's usb ports to support USB2 only.  This should enable the 4K@60Hz resolution.

 

Tech-Savvyness does not replace reading the fine manual.
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4 Posts

10-26-2020

Belgium

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Re:T14s(intel) external monitor 4k @60Hz

2020-10-26, 21:50 PM

I have the behavior when:

  • direct via USB-C (tried already all the options in the display)
  • direct via HDMI 
  • via de docking station via display port and HDMI

 

To my opinion this is not "normal" as it is clearly advertised on their website that the t14s supports up to 2 external displays 4k @ 60 Hz.

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612 Posts

06-26-2016

Germany

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Re:T14s(intel) external monitor 4k @60Hz

2020-10-26, 23:37 PM

@ kerckhd wrote:
 

 

To my opinion this is not "normal" as it is clearly advertised on their website that the t14s supports up to 2 external displays 4k @ 60 Hz.

 

this could be the case with an AMD T14s system, that supports DisplayPort 1.4.

Your Intel T14s system only supports DisplayPort 1.2, and the points I explained in my first reply are facts. 

That's how tech works. there are limitations, even if you don't want to believe it or have another opinion.

 

So if your monitor does not have the option to disable USB3 support, then you need to get a UBC-C to DisplayPort cable / adapter and use monitor's DP port instead of the USB-C port.

That's the only way to configure 4k @ 60Hz.   Or replace the USB-C dock and get a Thunderbolt 3 dock. 

 

the HDMI port on the Intel T14s  only supports HDMI1.4b.  Max supported resolution is 4096x2160@24Hz.

see https://psref.lenovo.com/Product/ThinkPad/ThinkPad_T14s_Gen_1_Intel

 

 

Tech-Savvyness does not replace reading the fine manual.
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474 Posts

09-04-2019

United States of America

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Re:T14s(intel) external monitor 4k @60Hz

2020-10-27, 4:05 AM

It will work if you connect your monitor using DP. Either a TB3 dock or a DP to USB converter straight to your notebook. The former works as I'm running it on a P43s with same or lesser specs than your newer T14s. I haven't tried the latter but considered it after some research. Previously I used HDMI straight to the P43s and got 4K but at 30Hz only. With DP using a TB3 dock am able to achieve 4K at 60Hz. There is really no noticeable difference for ordinary office work if that is what your do so don't waste your money if you don't need to IMO.

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4 Posts

10-26-2020

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Re:T14s(intel) external monitor 4k @60Hz

2020-10-27, 9:25 AM

What I meant it's not normal that it's so difficult to have a new laptop (2020 model) to work with a 4k screen.

 

Also the documentation for the combability between the laptop / docking station / Monitors is very much distributed.  I hope Lenovo fixes this. 

I only replace my laptop ever 2/3 years so I'm not as deep in the hardware details. 

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Germany

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Re:T14s(intel) external monitor 4k @60Hz

2020-10-27, 9:48 AM

 

yes it's confusing.  I usually do not recommend 4K display, when laptop only supports DisplayPort 1.2. Intel is to blame here, they did not implement DP1.4 support for a long time.

Intel recently introduced  DP1.4 with the new Intel Xe generation.

 

One more thing. if you try connecting monitor with USB-C cable to system, make sure the USB-C dock in unplugged. Are you sure there is no option to disable USB ports or limit to USB2 speed?
 

Tech-Savvyness does not replace reading the fine manual.
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4 Posts

10-26-2020

Belgium

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Re:T14s(intel) external monitor 4k @60Hz

2020-11-18, 9:38 AM
There's no option to disable it. I solved it by purchasing a usb-c to display port cable. This gave the "wanted" result. I still need to plug in 2 cables now instead of 1 but it's doable. Still I believe lenovo could do a better job if you purchase the machine and a dock what will be possible and what not. It's buried somewhere in all the documentation.
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17 Posts

08-27-2014

Austria

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  • Message 9 of 10

Re:T14s(intel) external monitor 4k @60Hz

2021-02-20, 20:09 PM

If I may attach my question here:

 

I also have a T14s with Intel chip and tried to attach two displays via several USB-C docks to it. I am only able to get 2x1080p running but I would like to get 1x1440p and 1x1080p. DP 1.2 should be able to get 2x1440p@60 Hz or am I wrong? Is it the adapters or the Thinkpad?

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612 Posts

06-26-2016

Germany

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Re:T14s(intel) external monitor 4k @60Hz

2021-02-21, 14:29 PM

As you have already proven yourself, USB-C docks support two displays up to FHD @ 60Hz only when connected to a DP1.2 system.

 

You can connect two 1440p displays via a Thunderbolt dock or via a proper docking station like the Ultra/Pro docking stations. Avoid USB-C docks for DP1.2 systems if you need high-resolution displays.

 

Tech-Savvyness does not replace reading the fine manual.
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