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06-14-2019

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T480s and USB C Dock - 3 external monitors - problems

2019-06-14, 7:57 AM

hi, 

 

 I have read that this is possible and works for people but in my case it is not working.

I have 3 monitors:

- hp with resolution 1920x 1200 - connected with dock 

 

and I can work on my laptop screen as third monitor and it is OK. 

BUT 

when I connect 3rd monitor using vga and close laptop lit I',m not able to change resolution on 3rd monitor and have there only 640x480 resolution.

When I for example disconnect 1st monitor then I Can change on 3rd (vga) the resolution to recommended 1600x...

So it looks like intel gfx doesn't handle 3 monitors.

I have upgrade grf driver from support site and install dock driver. 

 

Can I do anything more? or the laptop just doesn't handle 3 monitors with big resolutions?( which will be strange because it can handle 3rd laptop screen with 1920)

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296 Posts

08-02-2018

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Re: T480s and USB C Dock - 3 external monitors - problems

2019-06-19, 22:00 PM

Hi PrzemekJ! 

 

Welcome to the community forums. 

 

This concern was already answered from this Forum thread: https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T/T480s-and-USB-C-Dock-3-external-monitors/td-p/4359944

 

Let us know if you have any other questions. 

 

Regards, 

Matt_lenovo



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3 Posts

06-14-2019

PL

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Re: T480s and USB C Dock - 3 external monitors - problems

2019-06-24, 8:10 AM

hi, 

 

 I have read the topic that You linked but there 3 monitors are working. In my case I have problem with resolution of 3rd monitor which is not changable as in screenshot attached.

 

I have this dock station: Lenovo ThinkPad USB-C Dock 40A90090EU

 

Beside that I found on your support page: https://support.lenovo.com/pl/en/accessories/acc100348

that:

1. from documentation https://download.lenovo.com/pccbbs/options_iso/tp_usbc_dock_sp40l36280_ug_en.pdf

". The external monitor display is blank, or the images on the external monitor flutter. Connect one or two external monitors at a time. It is not recommended that you connect three external monitors"

2. in section Hardware Compatibility there is not T480s. 

 

In that case main question is: Is my dock station support or not 3 external monitor (without laptop T480s screen)

 

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Re: T480s and USB C Dock - 3 external monitors - problems

2019-07-08, 17:58 PM

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09-10-2018

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Re: T480s and USB C Dock - 3 external monitors - problems

2019-12-27, 10:05 AM

Any news on the issue? I got same problem with my T470

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4777 Posts

04-25-2008

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Re: T480s and USB C Dock - 3 external monitors - problems

2019-12-29, 0:28 AM

The Gen 2 40AS dock will do this, but not the Gen 1 40A9 dock.

 

https://support.lenovo.com/us/en/solutions/pd029622

 

Hope this helps!

I don't work for Lenovo. I'm a crazy volunteer!
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06-26-2016

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Re: T480s and USB C Dock - 3 external monitors - problems

2019-12-29, 15:09 PM

 


 wrote:

The Gen 2 40AS dock will do this, but not the Gen 1 40A9 dock.

 

But only up to a resolution of 1024x768@60Hz  for each external display!   It's highly dependent on the host system's  supported DP version.  All  T-Thinkpads like the T480s do support only DP1.2.

You're far better of using a Thunderbolt 3 capable dock.

 

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