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Dual displays from Thunderbolt 3 port - Y740

2019-11-22, 20:38 PM

Tried using the Lenovo chat support but didn't find it particualrly helpful....

 

I have a Lenovo Legion Y740, and I also have a Cable Matters Thunderbolt 3 docking station.  I am attempting to run two external displays through the docking station, one connected by thunderbolt and another connected by HDMI.  They would be an extension of the desktop, not mirroring it.

 

The issue I'm running into is that only one monitor comes on.  If I unplug one, the other monitor comes through, but I cannot run both monitors through the docking station. I can plug one monitor directly into the laptop and one into the dock, and then I can get both working at the same time, but I'd love to run both monitors through the docking station so I only have to worry about one plug. 

 

I tried looking through the documentation to see if the Thunderbolt 3 ports supports 2 external displays, but couldn't seem to find anything.  Trying to figure out if this is an issue with the dock or the laptop.

 

Does anyone know if the thunderbolt 3 port on a Lenovo Y740 supports 2 external displays?  Thanks!  

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734 Posts

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Re: Dual displays from Thunderbolt 3 port - Y740

2019-11-25, 14:48 PM

Hi bahamut22,

 

Welcome to the Community Forums.


Kindly send us the MTM (Machine-type-model) of your laptop, so we can take a closer look.

 

 

I'll wait for your update on this.

Regards,

Jack_Lenovo1



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15 Posts

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Re: Dual displays from Thunderbolt 3 port - Y740

2019-11-25, 15:25 PM
Sure thing. My MTM is 81HE0004US
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Re: Dual displays from Thunderbolt 3 port - Y740

2019-11-25, 16:12 PM

Hi bahamut22,

 

Thanks for the information.

 

Are you running both displays off DP or are you running one through HDMI?

 

I would recommend running one display through HDMI and one through DP.

 

Let us know if this helps.

Regards,

Jack_Lenovo1



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Re: Dual displays from Thunderbolt 3 port - Y740

2019-11-25, 16:27 PM
Thanks for the recommendation, but that wasn't really my question.

Again, I'm attempting to run two displays through my Thunderbolt 3 port. I'm able to run one through the port just fine. My HDMI port and my DP port on the laptop work fine. All I'm asking is if my thunderbolt 3 port supports two external displays, or if it is limited to one. No one at Lenovo seems to be able to answer this question for me.

I understand I can run two displays through different ports, but I'd love to be able to do everything through the one Thunderbolt port. If there's a technical limitation specifying that I can't do that through the Thunderbolt port, then fine, I'll make do. But I'm just trying to investigate whether or no this is an issue with my Thunderbolt port of the dock it is connected to. Thanks.
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Re: Dual displays from Thunderbolt 3 port - Y740

2019-11-25, 16:40 PM

Hi bahamut22,

 

Thanks for writing back.


In theory the setup should work since you are using a Docking station. Since the Y740 's TB3 port is powerful enough for this. 

 

The only issue I can see is that you are using a third-party docking station that maybe the reason why you are unable to use two monitors at once.

 

Lenovo has a Docking station finder for your machine (80HE) this link should show you the recommended docking stations for this machine.

 

Hope this helps,

Jack_Lenovo1



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  • Message 7 of 24

Re: Dual displays from Thunderbolt 3 port - Y740

2019-11-25, 16:45 PM
Thanks, I assumed so as well. I'm using a Cable Matters dock, and their line is that my Thunderbolt port doesn't support two displays, but I was fairly certain it did. I just wanted to confirm that with Lenovo so I could have something to say back to them.

I'll update if Cable Matters says anything new. Thanks for the help in the meantime.
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Re: Dual displays from Thunderbolt 3 port - Y740

2019-11-25, 16:49 PM

Hi bahamut22,

 

Thanks for writing back.


If possible we would like to recommend asking the Docking station manufacturer for any drivers that they can release for this product.

 

We'll keep an eye out for your update.

Jack_Lenovo1



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  • Message 9 of 24

Re: Dual displays from Thunderbolt 3 port - Y740

2019-11-25, 16:55 PM
Certainly and thanks! Its a Cable Matters Thunderbolt 3 Docking Station. Product can be found here: https://www.cablematters.com/pc-887-133-aluminum-thunderbolt-3-dock-with-dual-4k-60hz-video-and-60w-power-delivery.aspx

Thanks.
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15 Posts

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  • Message 10 of 24

Re: Dual displays from Thunderbolt 3 port - Y740

2019-11-26, 13:51 PM
I received this response from Cable Matters:

"Your laptop can support 2 external displays with Thunderbolt 3 Port while connected with a USB-C docking station. But when it’s connected to a Thunderbolt 3 Dock, it can support one external display only.

We’ve tested the connection with Lenovo y series and Thunderbolt 3 Dock, USB-C Dock in our lab yesterday to confirm this. That’s why we recommend the Dual Monitor USB-C Dock in last email."

Does it makes sense that I can get two external monitors with USB-C but not Thunderbolt? Sounds like it might be something other than a hardware issue, but I must admit there's lot here that doesn't make sense to me...
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