https://bugs.freedesktop.org/show_bug.cgi?id=101387
--- Comment #19 from Carlo Caione carlo@caione.org --- Those patches do not solve the issue but I noticed that the visual corruption at boot is not reproducible on the latest linus master. I bisected and found out that the commit solving the problem is https://patchwork.freedesktop.org/patch/151545/
So the latest problem still to be addressed is the scrambled colors in plymouth on reboot / poweroff.
Thanks,