4K 60Hz with RGB colour requires that: 1. The computer's HDMI port supports HDMI 2.0; and 2. The HDMI cable supports HDMI 2.0; and 3. The screen supports HDMI 2.0 (https://en.wikipedia.org/wiki/HDMI#Refresh_frequency_limits_for_standard_video)
It appears #1 is true because: https://www.intel.com/content/www/us/en/products/boards-kits/nuc/kits/nuc8i5beh.html It appears #3 is true because: https://www.lg.com/au/it-monitors/lg-27UD58 So I suggest the problem most likely is that you're not using a high enough quality HDMI cable. Try replacing the cable with another that you are sure supports HDMI 2.0. Although that is for 8-bit true colour only... If you are really wanting to use "deep color" (10-bit) at 4K 60Hz then you will need a computer, cable and monitor that supports HDMI 2.1 (https://en.wikipedia.org/wiki/HDMI#Refresh_frequency_limits_for_HDR10_video). Unfortunately both your computer and monitor only support HDMI 2.0 so do not support deep colour modes of 4K 60Hz. ** Package changed: xorg (Ubuntu) => ubuntu ** Changed in: ubuntu Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1808653 Title: xorg? 4k only at 30hzIntel® Iris™ Plus 655 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1808653/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
