The APU 2200G with ASUS board -HDMI, can Use The 4K with windows. The 4K 4:4:4 60Hz with windows it's can.
but, The APU can't Use The 4K with Ubuntu(fast. updated kernel), Fedora(fast).
but of but. The APU support The 4K with Arch linux.
The monitor is made by LG in Korea. support 4K 4:4:4 60Hz.
oh, i will buy The Intel CPU for my Linux.
I did The xrandr --newmode, --addmode, cvt 3840 2160.
but It's can't see Me 4K. just 768.