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47 Posts

12-24-2012

IE

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  • Message 1 of 13

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

2019-06-11, 17:30 PM

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. 

 

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9 Posts

06-24-2019

CN

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  • Message 2 of 13

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

2019-07-03, 3:49 AM

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

thank you!

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47 Posts

12-24-2012

IE

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  • Message 3 of 13

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

2019-07-03, 6:31 AM

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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4 Posts

11-18-2019

RU

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  • Message 4 of 13

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

2019-11-18, 18:48 PM

Hello,

 

TBT  Gen 2 dock doesn't work as expected too. According to compatibility matrix it should easily support 2 monitors with 3840*2160@60Hz but in reality it does support one with 2560*1440@60Hz and second one could be set to 1920*1080@30Hz maximum. Could you please help with that.

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1 Posts

06-23-2017

US

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  • Message 5 of 13

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

2019-12-16, 1:42 AM

With the Lenovo Thunderbolt Dock Gen 2, I can get 2560x1440 60Hz on the first screen and 1920x1080 with 29 Hz interlaved on the second screen which flashes annoyingly.

 

The other option is to get both monitors running at 1920x1080 with 50Hz which isn't at full native resolution but better than nothing. It will even run the laptop LCD with a third monitor in that configuration.

 

I've played with combinations of the DisplayPort and HDMI connections but cannot seem to get the two externals running at 2560x1440 on either HDMI or DP. I've updated the TB drivers and software and the docks firmware along the way to see if it was something that was fixed with an update.

 

Anybody have any recommendations, I'll be happy to try them out.

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1 Posts

07-25-2020

US

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  • Message 6 of 13

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

2020-07-25, 21:46 PM

Any fix for this?

 

Having a similar issue but with two monitors. When one monitor is active, its display resolution is 2560X1440 and is sharp and clear. When I turn on the second monitor, that specific monitor reverts to 1920 x 1080 and looses its clarity. The second monitor that is now active, looks sharp and clear, with a resolution of 1920 x 1080

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5165 Posts

04-25-2008

US

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  • Message 7 of 13

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

2020-07-25, 23:51 PM
Hi Cully, What is your Thinkpad model, and exactly which model dock?
I don't work for Lenovo. I'm a crazy volunteer!
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4 Posts

11-18-2019

RU

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  • Message 8 of 13

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

2020-07-26, 8:00 AM

Please make sure you're using Thunderbolt 3 port, bot USB-C one on your laptop. Ports look similar and located near to each other. Once I replaced cable from USB-C to Thunderbolt port the issue was fixed.

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4 Posts

11-18-2019

RU

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  • Message 9 of 13

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

2020-07-26, 8:00 AM

see my answer above

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1 Posts

09-14-2020

DE

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  • Message 10 of 13

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

2020-09-14, 16:57 PM

Hello dear support,

 

i's wondering if this issue is the same for T590 since i apparently can't connect 3 monitors either successful. Only two monitors + laptop works, but i intend like "@jb42" using 3 external monitors while closing the lid of my laptop. This constellation worked perfectly well with my old T560 on its docking station but wouldn't work on my newer T590 and the "usb-c dock gen2". It seems like were're moving more steps behind than forward regarding "multi monitors". Please help me in getting my previous 3 monitors constellation back on my new T590.

 

Thanks for a quick assistance !

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