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HoshinoArika
Fanfold Paper
Posts: 10
Registered: ‎10-25-2018
Location: CA
Views: 460
Message 1 of 3

E585 Video output through HDMI only 4k 50Hz


HDMI Output 4K.png

 

This is what I got when I am using the HDMI port as output to my 4K monitor.

 

There is no issue with the monitor I am using (LG 27UD68) and the cable I am using (High-Speed HDMI Amazon Basic).

 

The monitor works perfectly (4K@60Hz) on other HDMI devices, such as my PS4 PRO, NVIDIA SHIELD, XBOX ONE X.

 

And it also works perfectly (4K@60Hz), when I am using the USB-C port through a USB-C to DisplayPort cable to output video to this monitor.

 

I cannot find why 4K@60 is not an option on this device through HDMI,

If the port is HDMI 1.4 then it should possibly be limited at 4K@30.

 

This might be a driver issue with the Vega 8 graphics adapter, but I cannot tell.

And Lenovo technician should work on this issue.

HoshinoArika
Fanfold Paper
Posts: 10
Registered: ‎10-25-2018
Location: CA
Views: 356
Message 2 of 3

Re: E585 Video output through HDMI only 4k 50Hz

UPDATE 2018/11/29

 

I got 4K60Hz working on my Sharp 4K Roku TV through HDMI,

I went to advanced display properties and changed the refresh rate to 60.

 

I also confirmed that the TV runs at 60Hz by checking status and 

testing it using the UFO test.

 

Why I can only get 4K@50Hz on that LG monitor still unknown and need further testing.

 

jeremyshaw
802.11n
Posts: 141
Registered: ‎07-13-2018
Location: US
Views: 341
Message 3 of 3

Re: E585 Video output through HDMI only 4k 50Hz

I don't have a solution either, but AMD's Ryzen APUs supports HDMI 2.0 spec. 

 

A quote from another forum that may be tangentially related?

 

"The fix is to go in the Monitor menu and make sure "Ratio" under "Quick Settings" is 1:1 or Original (NOT Wide). For me it was set to Wide when I got it, and when in "Wide" it limits to 30Hz."

 

http://www.tomshardware.com/forum/id-3335364/27ud68-30hz-option-60hz.html

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