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vsamak
Paper Tape
Posts: 3
Registered: ‎12-01-2015
Location: USA
Views: 8,851
Message 1 of 9

Can Yoga 900 drive external display 4k @ 60hz via usb-c -> DP?!

Hi, 

 

Can someone from Lenovo officially confirm or someone who has bought this laptop test this and confirm, can the new Yoga 900 output 4k resolution @ 60hz to an external monitor, such as Dell P2715Q? 

 

What I see in the specs, it has Intel HD 520, and the spec sheet says DisplayPort 1.2 via USB-C can drive

4096x2304 @60Hz

 

However, there's no confirmation anywhere of this, neither from Lenovo, nor from users. Most USB-C to DP cable makers haven't tested this yet. 

 

I'm seriously considering the new Yoga 900 as a replacement for my T410. Main use is business and photo editing, and looks like an awesome laptop. The ability to hook up 1 external monitor at 4k @60hz is critical for me, otherwise, it's a Dell XPS 13.

 

Thanks in advance,

Vele

Guru
Posts: 259
Registered: ‎09-04-2012
Location: DE
Views: 8,798
Message 2 of 9

Re: Can Yoga 900 drive external display 4k @ 60hz via usb-c -> DP?!

Do you think that the platform specifications by Lenovo are untrustworthy?

vsamak
Paper Tape
Posts: 3
Registered: ‎12-01-2015
Location: USA
Views: 8,764
Message 3 of 9

Re: Can Yoga 900 drive external display 4k @ 60hz via usb-c -> DP?!

My question was about verifying and confirming this output in the specs. I haven't been able to find any USB-C to DisplayPort cable or docking station maker which confirms. They all say 4k @ 30hz.

 

Furthermore, it would be nice for Lenovo to officially confirm if this (usb-c) can support a docking station with DP at 4k 60hz, and for example ethernet, or only 1 DisplayPort at this resolution. Also, can it drive 2 QHD screens (2550x1600) @ 60hz, or only 1. 

 

I think these are valid questions to confirm before a purchase. I am a bit disappointed that Lenovo isn't actively supporting these forums or the Q&A on their shopping website. 

 

 

Guru
Posts: 259
Registered: ‎09-04-2012
Location: DE
Views: 8,762
Message 4 of 9

Re: Can Yoga 900 drive external display 4k @ 60hz via usb-c -> DP?!

Have a look at this USB Type C to DisplayPort cable and its reviews:
http://www.amazon.de/Stecker-Adapter-Displayport-Macbook-Schwarz/dp/B00YBH257Y/
There are definitely some adapters that support 4K@60Hz.

As the USB Type C port of the Yoga 900 transfers native DisplayPort 1.2 signals, you can use two 2560x1440 or 2560x1600 screens - either via Daisy Chaining or via an MST Hub.
vsamak
Paper Tape
Posts: 3
Registered: ‎12-01-2015
Location: USA
Views: 8,752
Message 5 of 9

Re: Can Yoga 900 drive external display 4k @ 60hz via usb-c -> DP?!

Thanks for the link. This seems to be one of the first such cables advertized. 

 

However, it's a USB 3.1 and the comments are from Dell's new XPS 13/15 laptops with Skylake, which are the competitors I'm considering. Both of these laptops explicitly state DisplayPort 1.2 native support via USB 3.1 gen 2 (10gbps) connection, which is part of its Thunderbolt 3 (40gpbs) port.

 

This is VERY different and much more xplicit than Lenovo Yoga 900's USB 3 (type C) port. There's apparently a big difference in data rates and support of USB 3.1 gen 1, gen 2 and Thunderbolt 3. 

 

This is the reason why I'm interested in actual use case of yoga 900 driving 4k @60hz. Can the included USB-C (3.0 gen 1) port support alt-mode to drive 4k @60hz as suggested in the Lenovo specs? If so, is it taxing the CPU heavily?!

 

I think these are valid questions, and I appreciate your help, however, there's still no official confirmation or use case for my question. 

cliffchaney
What's DOS?
Posts: 1
Registered: ‎03-03-2016
Location: US
Views: 7,386
Message 6 of 9

Re: Can Yoga 900 drive external display 4k @ 60hz via usb-c -> DP?!

Did you ever find out the answer? Based on the fact that it's only a USB 3.0 port, I assume that it will not do 4K @ 60Hz. Additionally, I've seen other discussions that suggests it doesn't support MST either - so, dual monitors are out - at least via DisplayPort.

 

Can anyone verify the maximum resolution that it will support and at what refresh rate?

jmutsaerts
What's DOS?
Posts: 1
Registered: ‎07-24-2016
Location: CH
Views: 5,703
Message 7 of 9

Re: Can Yoga 900 drive external display 4k @ 60hz via usb-c -> DP?!

I didn't get the yoga 900 to work @2560x1440 with an ASUS PB278 external display through USB-C. The maximal resolution I got was 1920x1280. I tried two different USB-C >> HDMI Adapters.

 

My next bet is to buy the docking stations for 4K monitors via USB 3, normal shape. I hope that will work. 

christianbran
Paper Tape
Posts: 3
Registered: ‎09-03-2016
Location: ID
Views: 5,257
Message 8 of 9

Re: Can Yoga 900 drive external display 4k @ 60hz via usb-c -> DP?!

Hey Bro,

 

btw have you got your problem solved?

I'm trying to hook my yoga 900 to 

LG 43UF670T UHD

it's okay if it can fire only 30hz, but my LG TV only has HDMI input

christianbran
Paper Tape
Posts: 3
Registered: ‎09-03-2016
Location: ID
Views: 5,257
Message 9 of 9

Re: Can Yoga 900 drive external display 4k @ 60hz via usb-c -> DP?!

bro,

 

so your 4k display only has a hdmi input?

have you try 

Jca374 from the link

http://j5create.com/our-products/usb-hub/jca374.html

https://www.amazon.com/j5create-JCA374-USB-Type-C-Multi-Adapter/dp/B01FI7PEH8

 

it looks promisingly work I think

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