On testing linux 4.5-rc( 1 and 2) I have found that my display is not rendered
correctly on starting the X server. My screen is mainly black with portions of
the desktop appearing from time to time. I have tried the kernel on two
different machine with different Radeon cards and the result is the same. The
system is a recent LFS build and I use fvwm as my window manager. I will
forward xorg.conf and Xorg.0.log files from my testing.