Hi there,
with actual kernel-4.16.0-300.fc28.armv7hl from Fedora 28 Beta no Xorg
is working on my Odroid XU4 and the system load is constant at 4 .
Hints:
with kernel-core-4.16.0-0.rc6.git2.1.fc29.armv7hl everything is working
fine. I can work on Xorg with mate (slow, but it works) an system load
is nearly 0.
Greetings
Andreas