https://bugs.freedesktop.org/show_bug.cgi?id=102646
--- Comment #25 from Ruben Harutyunyan harutyunyan.ruben@gmail.com --- Seems like this is a regression actually. I've managed bisect the commit which caused the problems.
Last working commit: https://cgit.freedesktop.org/~agd5f/linux/commit/?h=drm-next-4.15-dc&id=...
Breaking commit: https://cgit.freedesktop.org/~agd5f/linux/commit/?h=drm-next-4.15-dc&id=...
Keep in mind that you need https://cgit.freedesktop.org/~agd5f/linux/commit/?h=drm-next-4.15-dc&id=... commit to be able to compile the kernel, but judging by the changes the merge commit was the one that broke it.
Some more details:
1) Disabling/enabling FreeSync doesn't matter 2) Issue happens under Xorg KDE/Wayland Gnome/Xorg GNOME 3) HDMI or DP doesn't matter
I'd try to narrow it down to the exact part of the commit that causes the issue, but I am having an issue with my Ryzen soft locking thread by thread until a complete lockup happens when compiling with 16 threads.