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Mark_94
Paper Tape
Posts: 5
Registered: ‎08-01-2018
Location: IL
Views: 404
Message 1 of 8

TB3 adapter not working Ideapad 720s

Hello,

I got the Ideapad 720s 15IKB and I wanted to hook it up with 2 external monitors (1440p and 1080p)

So I bought this adapter because my laptop has TB3 input. 

Currently I connect only 1 monitor and it doesnt work at all Smiley Sad

Any suggestions? I chose my laptop with TB3 for this exact purpose.. Please help

 

Update: as for right now, when I connect 1 1440p monitor, my laptop detects it but my monitor's screen is black (as it is off)

Screenshot_4.png

Retired Support Specialist
Posts: 402
Registered: ‎08-02-2018
Location: US
Views: 356
Message 2 of 8

Re: TB3 adapter not working Ideapad 720s

Hi Mark_94!

 

Welcome to the Community Forums!

 

Checking the specification of Ideapad 720s, it supports Display Port 1.2a, https://psref.lenovo.com/syspool/Sys/PDF/Lenovo%20Laptops/ideapad%20720S%20(15_)/ideapad_720S_15.pdf. However, you need to have an active DisplayPort to HDMI / DVI adapter or cable for it to work. https://www.startech.com/faq/displayport_converter_dp_multi_mode



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Mark_94
Paper Tape
Posts: 5
Registered: ‎08-01-2018
Location: IL
Views: 344
Message 3 of 8

Re: TB3 adapter not working Ideapad 720s

I've updated original post, please check it again.

Bottom line, I dont understand why i need hdmi adapter if I have a cable that both ends are DP ( and my monitor has mini-dp input).

Social Support Agent
Social Support Agent
Posts: 533
Registered: ‎08-02-2018
Location: US
Views: 328
Message 4 of 8

Re: TB3 adapter not working Ideapad 720s

Dual Mode Display port has limitations and it is unavailable for USB-C ports. Also, the description of the adapter that you purchase clearly states that

 

"Not all computers (such as the Lenovo Yoga 720) support dual displays over Thunderbolt 3."

 

Regards,



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Mark_94
Paper Tape
Posts: 5
Registered: ‎08-01-2018
Location: IL
Views: 325
Message 5 of 8

Re: TB3 adapter not working Ideapad 720s

I dont have the Yoga, mine is Ideapad 720s . You think my laptop cannot be connected to 2 external monitors?
Social Support Agent
Social Support Agent
Posts: 533
Registered: ‎08-02-2018
Location: US
Views: 319
Message 6 of 8

Re: TB3 adapter not working Ideapad 720s

Sorry for the confusion. The statement above is also applicable to Ideapad 720s. I'm afraid that you won't be able to connect 2 monitors using an adapter as it is the limitation of the USB-C. Sending Display port signals over USB-C connection does not include the support for Dual-Mode. An active Display Port on the laptop is needed for it to work.



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Mark_94
Paper Tape
Posts: 5
Registered: ‎08-01-2018
Location: IL
Views: 309
Message 7 of 8

Re: TB3 adapter not working Ideapad 720s

That's a shame.. I bought my laptop with tb3 for this exact reason.. Im very disappointed...

Anyway, thanks for the help! 

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calvol
Punch Card
Posts: 16
Registered: ‎08-03-2018
Location: US
Views: 171
Message 8 of 8

Re: TB3 adapter not working Ideapad 720s

Yeah, the trick here is TB3 gives OEMs a choice of single or dual-lane PCIE implementation, and at the price point of the 720S, only single lane is supported.  Also, last I checked, Lenovo is still on TB NVM v5, while the latest release is NVM 18....!  So you're getting a poor-mans TB, albeit it works well with one display.  You would need an external GPU to drive two displays.

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