Hi,

i have RK3399 Friendly Elec board running ubuntu image(rk3399-eflasher-friendlydesktop-bionic-4.4-arm64-20180921) downloaded from FriendlyElec site itself.

Now when i connect 4K Monitor using HDMI, xrandr doesn't show this mode. Maximum resolution shown by xrander is 1920x1080 only.

How to enable 4K resolution setting on the board.