Cannot get 4K@60Hz with DP to HDMI active adapter

I have a laptop with Intel HD4600 video and a DP port. I also have 2 4K TVs, the LG UF6800 from 2015 and the recent 2017 Samsung MU6300. I got the Plugable DisplayPort to HDMI 2.0 active adapter to connect my laptop to the TVs. On the LG I am able to get 4K@60Hz. But with the Samsung, I am only able to get upto 4K@30Hz. Available refresh rates are shown in the Intel Graphics Properties software. When I connect the Samsung TV, it attempts to detect the type of device connected and gives up saying “Unknown Device”. If I manually set the device to “PC” I am able to select YCbCr color in the Intel Graphics Properties but still not 60Hz. If I attempt to add a Custom Resolution with 3840x2160 @ 60Hz, it says “Maximum bandwidth exceeded”. I have the latest drivers and as mentioned it works correctly with the LG TV. Please help.

Hello, thanks for posting and I will be happy to help!

Thank you for the description you are seeing. Since 4K@60Hz works with the LG monitor, we know that the adapter itself is working to display this resolution.

Would you be able to check on the HDMI UHD Color setting within your Samsung monitor’s on screen menu to see if it is Enabled (Settings > General > External Device Manager > HDMI UHD Color)? If it is not enabled, please enable it and test displaying at 4K@60Hz (you may need to reboot your system after making this change).

Please let us know if these steps help or not and we will go from there.

Thank you,

David W.
Plugable Technologies
www.plugable.com/support

Hello,

Yes, HDMI UHD Color is enabled for all HDMI ports, otherwise I would not be able to get 4:4:4 chroma. Even with that I can still only get 4K@30Hz. What next?

Thanks.

Hello David,

Anything else to try?

Thanks

Hello, thanks for the reply and apologies for the delayed reply.

Thanks for checking that UHD color setting. To further clarify, you’re not presented with a 60Hz options within the Advanced display properties when connected to the Samsung MU6300 monitor (example screenshot below)?

!](https://d2r1vs3d9006ap.cloudfront.net/s3_images/1693391/60Hzdropdown_inline.jpg?1516130430)](https://d2r1vs3d9006ap.cloudfront.net/s3_images/1693391/60Hzdropdown.jpg?1516130430)

Thank you,

David W.
Plugable Technologies
www.plugable.com/support

Yes, I see only upto 30Hz there (in monitor properties as shown in your screenshot) as well as in the Intel HD Graphics Control Panel as shown below !](https://d2r1vs3d9006ap.cloudfront.net/s3_images/1693546/30HzIntelGraphicsControlPanel_inline.png?1516156309)](https://d2r1vs3d9006ap.cloudfront.net/s3_images/1693546/30HzIntelGraphicsControlPanel.png?1516156309)

Hello, thanks for confirming this. Does the same issue occur regardless of HDMI port on the monitor you’re connecting to?

We know that the adapter and HDMI cable are working at 4K@60Hz on the LG TV. We’ve checked the UHD color settings to ensure that they are enabled and the manual for the monitor here --> http://downloadcenter.samsung.com/con… mentions this variable on page 105 of the manual stating “The native resolution is 3840 x 2160 at 60Hz with the HDMI UHD Color set to On. The native resolution is 3840 x 2160 at 30Hz with the HDMI UHD Color set to Off.” You’ve also ensured that the Intel graphics drivers are up to date for your system.

Unfortunately, I am low on steps to advise. The next thing to try would be to make sure the firmware for the monitor is up to date. Page 82 of the manual (linked above) illustrates how to update the firmware.

Thank you,

David W.
Plugable Technologies
www.plugable.com/support