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TE0810
What's DOS?
Posts: 2
Registered: ‎01-18-2013
Location: WA
Views: 637
Message 1 of 5

T420s 4171 - 3 display screens (2 external displays + laptop display)?

Hi,

 

I own a T420s 4171 and have 2 external monitors hooked up to my docking station. That works fine, but when I try to also display my laptop screen (as my 3rd screen), it won't enable it. It seems to only allow 2 viewable screens (2 external monitors OR 1 external monitor + laptop screen). I tested a T420s 4173 and was able to get 3 viewable screens, but not my 4171, even after updating all of the lenovo drivers. I was comparing video card specs (4171 vs 4173) and it looks to be the same. Can someone confirm/deny that I'm able to have 3 screens with my model?

 

Thanks.

ThorsHammer
Bit Torrent
Posts: 2,423
Registered: ‎04-08-2011
Location: US
Views: 626
Message 2 of 5

Re: T420s 4171 - 3 display screens (2 external displays + laptop display)?


@TE0810 wrote:

Hi,

 

I own a T420s 4171 and have 2 external monitors hooked up to my docking station. That works fine, but when I try to also display my laptop screen (as my 3rd screen), it won't enable it. It seems to only allow 2 viewable screens (2 external monitors OR 1 external monitor + laptop screen). I tested a T420s 4173 and was able to get 3 viewable screens, but not my 4171, even after updating all of the lenovo drivers. I was comparing video card specs (4171 vs 4173) and it looks to be the same. Can someone confirm/deny that I'm able to have 3 screens with my model?

 

Thanks.


The answer depends on the GPU chipsets in the machine.  If you have the Optimus video chipset, you have two gpus that will drive four external panels.  If you don't have optimus, you are limited to two.

 

What 4171 do you have?  For instance, the 4171-7FU is Optimus and should work.

TE0810
What's DOS?
Posts: 2
Registered: ‎01-18-2013
Location: WA
Views: 605
Message 3 of 5

Re: T420s 4171 - 3 display screens (2 external displays + laptop display)?

It's 4171 53U

ThorsHammer
Bit Torrent
Posts: 2,423
Registered: ‎04-08-2011
Location: US
Views: 596
Message 4 of 5

Re: T420s 4171 - 3 display screens (2 external displays + laptop display)?

That machine has a single integrated GPU from Intel and is limited to two displays.

lead_org Microsoft MVP Contributor
Microsoft MVP Contributor
Posts: 21,009
Registered: ‎12-19-2008
Location: Australia, Melbourne
Views: 591
Message 5 of 5

Re: T420s 4171 - 3 display screens (2 external displays + laptop display)?

you could always get a thinkpad usb 3.0 dock, which allows you to drive two external lcd of up to 1920x1200 LCD.

Or a Lenovo Displayport to Displayport splitter, which can drive 2 LCD of 1920x1200 (LCD itself needs to support displayport).
Regards,

Jin Li

May this year, be the year of 'DO'!

I am a volunteer, and not a paid staff of Lenovo or Microsoft

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