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candc
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Registered: ‎01-05-2018
Location: US
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Message 1 of 9

T570 doesn't support even single external 4k@60hz monitor?

Hi, I bought a T570 in 2017 and thought it can at least support 4k@60hz with the thunderbolt 3 port. However, I find that it may not be true. I got a thunderbolt 3-to-display-port cabel recently and connected it to my dell p2415q 4k display through the thunderbolt 3 port on the left side of my T570. When I tried to change the resolution setting in intel graphics option, I find that it only has 30hz option for 3840x2160 resolution. NO 60hz!!! I tried to update my intel driver to the latest. NOT WORKING. 30hz is the only option. I highly doubt the T570 specificaition is wrong. It doesn't support even single 4k@60hz. Any idea about what it is going on?

candc
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Message 2 of 9

Re: T570 doesn't support even single external 4k@60hz monitor?

Changing to another brand of the usb-c-to-display-port cable doesn't solves this problem neither. It is still 4k@30hz. It says the bandwidth is not sufficient.

CrypticLottery
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Registered: ‎01-08-2018
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Message 3 of 9

Re: T570 doesn't support even single external 4k@60hz monitor?

 

The hardware manual does indicate that the USB-C port can support your setup @ 60Hz.

 

https://download.lenovo.com/pccbbs/mobiles_pdf/t570_p51s_ug_en.pdf, printed page 36)

 

- 4096 x 2304 pixels / 60 Hz, with an external display connected to the USB-C connector
- 4096 x 2160 pixels / 24 Hz 3840 x 2160 pixels / 30 Hz, with an external display connected to the HDMI connector

 

Going through some of the release notes for various updates on the T570, I noticed that there are some uEFI BIOS updates in the past that 'Fixed some issues with Thunderbolt 3'. (https://download.lenovo.com/pccbbs/mobiles/n1vur11w.txt)

 

What version of hardware firmware are you running? The last firmware patch that addressed something with Thunderbolt 3 was 1.19 which was released on 30MAR17.

candc
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Message 4 of 9

Re: T570 doesn't support even single external 4k@60hz monitor?

You're right. The manual says that it supports 4k@60hz through thunderbolt 3 usb-c but it doesn't work. My hardware firmware is 1.28, the latest. I have also updated thunderbolt firmware too but it doesn't solve the problem.
CrypticLottery
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Message 5 of 9

Re: T570 doesn't support even single external 4k@60hz monitor?

The USB-C to DP devices that you tried, do they support DisplayPort 1.2? This is required by your monitor to support 60Hz.

 

http://www.dell.com/support/article/us/en/4/SLN296015?dgc=SM&cid=266889&lid=5129275 may help with troubleshooting the video connection for your monitor.

candc
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Message 6 of 9

Re: T570 doesn't support even single external 4k@60hz monitor?

Yes. It supports displayport 1.2. These cables on Amazon have been tested to work on the latest macbook pro to support 4k@60hz.

The error message I got from the Intel graphics settings is that the 4k@60hz exceeds the maximum bandwidth of T570 through thunderbolt 3.

A lot of users are trying to do two 4k@60hz external monitor with thinkpad T470/T570. But now it doesn't even support one 4k@60hz.
CrypticLottery
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Message 7 of 9

Re: T570 doesn't support even single external 4k@60hz monitor?

I would half-expect that the Nvidia chip would be powering the external monitor.

 

You can force your computer to use the Nvidia chip, follow the steps listed here - https://support.lenovo.com/us/en/solutions/ht078706#n

 

If you don't have the Nvidia software, don't download the individual drivers from Intel or Nvidia direct. Use the Optimus driver that best suits your environment that's provided by Lenovo.

candc
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Message 8 of 9

Re: T570 doesn't support even single external 4k@60hz monitor?

You're right. Nvidia chip should support that 4k@60hz. But the version of my T570 doesn't have a discrete graphics card. Only Intel graphics chip is used. Ideally, the graphics of intel 7300U that should support 4k@60hz too. This is quite strange. Called Lenovo tech support and they suggested sending the laptop back for checking.

The machine is running fine except this problem. I doubt that this is a problem for all T570.
CrypticLottery
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Message 9 of 9

Re: T570 doesn't support even single external 4k@60hz monitor?

Hmm - that's my bad. I just realized that I misread the PSRef sheet for the T570 - http://psref.lenovo.com/syspool/Sys/PDF/ThinkPad/ThinkPad%20T570/ThinkPad_T570_Platform_Specificatio...

 

I misread it as either Intel graphics processor and the Nvidia graphics processor.

 

Good luck with support!

 

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