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PrzemekJ
Paper Tape
Posts: 3
Registered: ‎06-14-2019
Location: PL
Views: 585
Message 1 of 4

T480s and USB C Dock - 3 external monitors - problems

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)

Social Support Agent
Social Support Agent
Posts: 296
Registered: ‎08-01-2018
Location: PH
Views: 487
Message 2 of 4

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

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...

 

Let us know if you have any other questions. 

 

Regards, 

Matt_lenovo



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PrzemekJ
Paper Tape
Posts: 3
Registered: ‎06-14-2019
Location: PL
Views: 441
Message 3 of 4

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

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)

 

PrzemekJ
Paper Tape
Posts: 3
Registered: ‎06-14-2019
Location: PL
Views: 326
Message 4 of 4

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

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