4K UHD resolution (3840x2160) not supported

Connecting the HDMI port to a 4K display only supports up to 1080p resolution. The display, cable, and port used are all verified to support 4K with an Amlogic S905 based board from a different vendor.

Using the display settings GUI, only 1080p and lower resolutions are available. Has anyone got 4K to work with the Ubuntu image? If so, what is the procedure?

[edit]
I should note that I am using the recent kernel compiled from source as instructed in the wiki.

Oh, please don’t use 4K display in ubuntu, That is very slow, The 2D graphic driver is not good enough for 4K display!

Whether the device is slow or not is of no concern to me. What is required for me to enable 4K UHD output? Additionally, as I noted in another thread, when a 4K device is connected to the USB-C port, the device will not boot. It locks up and displays garbage on the HDMI port.

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