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jb42
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Posts: 39
Registered: ‎12-24-2012
Location: IE
Views: 833
Message 1 of 3

Third monitor does not work on a USB-C Dock, Gen 2

I have 3 monitors (Dell U2417H, 1920*1080) on a USB-C Dock, Gen 2. Two monitors are connected via Display Port, one via HDMI. My laptop is a T480. I set the power setting "Power buttons and lid" => "Lid close action" => "Plugged in" to "Do nothing" and closed the lid to deactivate the laptop display (because Intel Graphics only supports 3 monitors). 

 

My problem is, that for the third monitor (connected via DP), Windows (10) only allows a maximum resolution of 1440*576, which results in no signal for this monitor.

 

I tried the third monitor in a setup with only two monitors, and then it worked as expected (so, it's not defect). Even in a setup with 2 monitors and the laptop screen, the monitors and the laptop screen work (so, it cannot be a max resolution restriction).

 

What could be wrong? What di I have to do to get the USB-C Dock running with 3 monitors?

 

Update:

I think I found the source of the problem. According to https://support.lenovo.com/ie/en/solutions/pd029622 the USB-C Dock only supports 3 monitors with 1920*1080 if the laptop (!) supports DP 1.4. Unfortunately this is obviously not the case for the T480. For laptops only supporting DP 1.2, only two monitors with  1920*1080 are supported, or three with 1024x768. 

 

Lenovo Employee Shirleywu
Lenovo Employee
Posts: 5
Registered: ‎06-23-2019
Location: CN
Views: 649
Message 2 of 3

Re: Third monitor does not work on a USB-C Dock, Gen 2

Hi customer, if you want get  3 monitors with T480, i suggest you use Thinkpad TBT dock gen2.

thank you!

jb42
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Posts: 39
Registered: ‎12-24-2012
Location: IE
Views: 635
Message 3 of 3

Re: Third monitor does not work on a USB-C Dock, Gen 2

Thanks for the reply, did not know that. I now use the ThinkPad Pro Docking Station that works well with 3 HD monitors. I was just disappointed that the USB-C Dock does not, and when you buy it, it's not made clear.

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