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03-26-2021

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Thunderbolt 3 Dock Gen 2

2021-03-26, 4:46 AM

I just got this dock so I could use my new Samsung 4k monitor along with Thinkpad T480 and a Dell HD monitor. However, whenever I have the 4K and HD monitors connected to the dock at the same time. I can only get the 4K monitor to display 2560x1440 and the HD monitor looks like the screen bounds are too far out. If I unplug the HD monitor, then the 4K monitor with display in 4K. Also, if I unplug the 4K monitor, the HD monitor display 1080p fine with no issues. How do I got both monitors to display properly?

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612 Posts

06-26-2016

Germany

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Re:Thunderbolt 3 Dock Gen 2

2021-03-26, 17:09 PM

you can't use a 4K display @60Hz and a second  display connected to a DP1.2 system like the T480 using only one DP stream.

This is basically what's happening. Connected to the dock, both displays share one DP1.2 stream. And its data rate is limited and nearly maxed out by the 4K display if configured to its native resolution @60Hz.

 

To use both displays, you need to reduce (1) the bandwidth requirements of one of the displays  or move (2)  one display to another DP stream.

 

1. You can try to configure the 4K display to 30Hz,  or  reduce the desktop resolution to  2560x1440@60Hz,  

OR

2. connect the FHD display to the T480's HDMI port.

 

and make sure the thunderbolt 3 dock is connected to the thunderbolt 3 compatible USB-C port.

Tech-Savvyness does not replace reading the fine manual.
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6676 Posts

08-02-2018

Philippines

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Re:Thunderbolt 3 Dock Gen 2

2021-03-26, 10:40 AM


Hello Kaijae!


Welcome to community forums


What is the connection between the docking station and the external monitor? According to the psref, the laptop can connect up to two external monitors via HDMI(4096 x 2160 @ 30Hz) and USB-Type C(4096 x 2304 @ 60Hz) and you can refer to this: https://psref.lenovo.com/Product/ThinkPad/ThinkPad_T480

 

You can also refer to the link below for the setup for the docking station.
link: https://support.lenovo.com/ph/en/solutions/pd029622-display-and-video-output-configurations-docking-stations#Ultra%20Docking

Regards

 

 

Jwes_Lenovo



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3 Posts

03-26-2021

United States of America

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Re:Thunderbolt 3 Dock Gen 2

2021-03-26, 15:40 PM

Thanks for getting back to me. Both of the monitors are connected via HDMI.

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612 Posts

06-26-2016

Germany

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Re:Thunderbolt 3 Dock Gen 2

2021-03-26, 17:09 PM

you can't use a 4K display @60Hz and a second  display connected to a DP1.2 system like the T480 using only one DP stream.

This is basically what's happening. Connected to the dock, both displays share one DP1.2 stream. And its data rate is limited and nearly maxed out by the 4K display if configured to its native resolution @60Hz.

 

To use both displays, you need to reduce (1) the bandwidth requirements of one of the displays  or move (2)  one display to another DP stream.

 

1. You can try to configure the 4K display to 30Hz,  or  reduce the desktop resolution to  2560x1440@60Hz,  

OR

2. connect the FHD display to the T480's HDMI port.

 

and make sure the thunderbolt 3 dock is connected to the thunderbolt 3 compatible USB-C port.

Tech-Savvyness does not replace reading the fine manual.

0 person found this solution to be helpful.

This helped me too

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3 Posts

03-26-2021

United States of America

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Re:Thunderbolt 3 Dock Gen 2

2021-03-27, 18:44 PM

I actually just figured it out. I was using the USB-C port to connect to the Dock from the laptop in stead of the Thunderbolt port. Once I moved the cable to that port everything worked. This is a pretty easy mistake to make, if someone sees this and knows how to post this in a FAQ I think it would help a lot of people.

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