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7 Posts

04-15-2021

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Dual thunderbolt 3 4K Monitors, only one monitor lights up

2021-04-15, 20:11 PM

Hi Everyone,

 

I have two LG 4K Ultrafiine Monitors connected using thunderbolt 3 connection to a brand new Lenovo X13 yoga gen 1 with I7 vPRO CPU.

i have tested this using direct connection to the monitors, and alternatively using my ducking (Cal Digit ts3 plus).

 

when I connect the laptop thunderbolt 3 port to the one of the monitors using thunderbolt 3, and have the monitors connected in a daisy chain, only the Laptop monitor works, but none of the LG monitors works.

 

when I connect everything using the CalDigit ts3 plus Dock, only the Laptop Monitor and one LG monitor will work.


I have other thunderbolt 3 laptops and all works well using this setup (all monitors light up with good results).

 

I had another X13 Yoga before (can’t remember which generation it was), and all monitors have been working with this laptop.

 

so my question is straight forward:

is thunderbolt 3 is fully supported on x13 gen 1?

or what is the difference between thunderbolt specification x13 yoga gen 1 and gen 2?

 

I have upgraded and updated all of the components.

 

thanks in advance,

 

 

Moderator comment: Moved to the proper forum. (NateS)

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7 Posts

07-20-2020

Japan

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Re:Dual thunderbolt 3 4K Monitors, only one monitor lights up

2021-04-20, 6:29 AM

Hi Phonixx6,

 

As you confirmed on manual, No.1 port is USB-C with DP1.2 compatible, No.3 port is TBT3 port also with DP1.2 compatible.  

You may also confirm port spec on Psref website.

I suggest if you connect two monitors with these two ports, you may success light up dual 4K with 60Hz. 

 

You also confirmed that No.1 Type-C port cannot be used with HDMI port at same time. So it is also possible to connect monitors on No.3 TBT port and HDMI port to get  dual 4K output. But the HDMI port is HDMI 1.4b, which supports 4K30Hz at most. 

 

I see you have got a Cal Digit ts3 plus dock, which supports dual 4K through DP and TBT ports on dock. However, system side ports are DP1.2 compatible, which may not support dual 4K60Hz date rate.  I suggest you try lower the fresh rate to 4K30Hz to see if if works. 

As it is not ThinkPad native dock, we are not sure if dual 4K works or not. But, we have tested that dual 4K30Hz monitor works well on ThinkPad TBT3 docks with X13 yoga gen 1.  You may refer this link.

 

Hope this could help you.

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1631 Posts

01-08-2021

Philippines

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Re:Dual thunderbolt 3 4K Monitors, only one monitor lights up

2021-04-15, 22:15 PM

Hello Phonixx6,

 


Welcome to Lenovo Community

 

 

Based on the Product specifications reference, your x13 gen 1 supports Thunderbolt 3 technology.
https://psref.lenovo.com/Detail/ThinkPad/ThinkPad_X13_Gen_1_Intel?M=20T20004GB

 

You can also check the user guide.
https://download.lenovo.com/pccbbs/mobiles_pdf/t14s_gen_x13_gen1_ug_en.pdf


Hope this helps

 

 


Regards, 
Lorenzo_Lenovo



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7 Posts

04-15-2021

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Re:Dual thunderbolt 3 4K Monitors, only one monitor lights up

2021-04-16, 10:40 AM

Hi Lorenzo,

 

thanks for your answer.

 

I also see that the laptop supports thunderbolt 3, and as I stated before my other x13 was working with dual monitors under the same setup.

 

i hope that’s not an hardware problem, as I have tried everything until now.

 

Could you please suggest how to verify this?

 

Thanks,

 

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7 Posts

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Re:Dual thunderbolt 3 4K Monitors, only one monitor lights up

2021-04-16, 17:25 PM

Hi Lorenzo,

 

could you please tell me how many 4K monitors are supported in this laptop?

 

i looked into the documentation and it’s stated that one should connect the monitor to the power port, but I am really confused now.

 

when I connect to port 1 nothing works (see picture), which port ist the right one?

 

thanks

1E6B3E5C-520F-4F50-B1D8-51C350264BD8.jpeg
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5492 Posts

04-25-2008

United States of America

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Re:Dual thunderbolt 3 4K Monitors, only one monitor lights up

2021-04-17, 1:10 AM

There's only one Thunderbolt 3 compabible port on the ThinkPad X13 Gen 1 (Intel) and it's the frontmost USB-C connector on the left side (see page 4 of the User Manual you are looking at).

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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7 Posts

04-15-2021

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Re:Dual thunderbolt 3 4K Monitors, only one monitor lights up

2021-04-17, 9:18 AM

Sorry, I have to correct you.

According to the manual page 4 that you mentioned, TB 3 (port number 3) is in the middle, and not leftmost side.

AC9FAA08-E930-4714-9B85-3BD6091FC698.png 681E8784-9A56-4489-87A7-45A6DC1938FF.png
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5492 Posts

04-25-2008

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Re:Dual thunderbolt 3 4K Monitors, only one monitor lights up

2021-04-17, 13:53 PM

We're both right! It depends where you're looking from! By frontmost and left I'm referring to what you see when you're using the laptop, i.e. the Thunderbird 3 port on is the left side of the computer, and it is the frontmost USB-C connector, nearest to you. Either way, there's one Thunderbird 3 connector. 

 

This is a bit of a headslapper on many ThinkPads.

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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7 Posts

04-15-2021

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Re:Dual thunderbolt 3 4K Monitors, only one monitor lights up

2021-04-17, 15:27 PM

Yeah, I guess you could look at this from this perspective.

anyway I’m so frustrated because I can only use one monitor of my two 4K LG monitors.

with my Mac or my old windows laptop, it all was working well.


if someone would at least clearly tell me that it’s not technically by design possible to power two monitors on the x13 gen 1, I would say it ok.

but at the moment it’s really not clear what is support and what’s not.

Do you have some advice?

 

🙏 

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7 Posts

07-20-2020

Japan

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Re:Dual thunderbolt 3 4K Monitors, only one monitor lights up

2021-04-20, 6:29 AM

Hi Phonixx6,

 

As you confirmed on manual, No.1 port is USB-C with DP1.2 compatible, No.3 port is TBT3 port also with DP1.2 compatible.  

You may also confirm port spec on Psref website.

I suggest if you connect two monitors with these two ports, you may success light up dual 4K with 60Hz. 

 

You also confirmed that No.1 Type-C port cannot be used with HDMI port at same time. So it is also possible to connect monitors on No.3 TBT port and HDMI port to get  dual 4K output. But the HDMI port is HDMI 1.4b, which supports 4K30Hz at most. 

 

I see you have got a Cal Digit ts3 plus dock, which supports dual 4K through DP and TBT ports on dock. However, system side ports are DP1.2 compatible, which may not support dual 4K60Hz date rate.  I suggest you try lower the fresh rate to 4K30Hz to see if if works. 

As it is not ThinkPad native dock, we are not sure if dual 4K works or not. But, we have tested that dual 4K30Hz monitor works well on ThinkPad TBT3 docks with X13 yoga gen 1.  You may refer this link.

 

Hope this could help you.

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7 Posts

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Germany

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Re:Dual thunderbolt 3 4K Monitors, only one monitor lights up

2021-04-21, 17:53 PM

Thanks otsuki,

 

you have been right, I’ve connected both the USB-C and thunderbolt 3 ports on the laptop and it works well, with both Dockings (Lenovo and cal digit)

I have to admit that I find this setup a bit disappointing:

with both my MacBook Pro and my past x13 yoga gen 2, two 4K monitors have been working using one TB3 port.

now I need to connect two cables, that’s kind of beats the luxury of using TB3, that is one cable for dual display, mouse, keyboard, lan.


🧐 unfortunately I fail to understand the design thought/limitation behind.

 

KR,

 

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