https://bugzilla.kernel.org/show_bug.cgi?id=201067
--- Comment #6 from Nicholas Kazlauskas (nicholas.kazlauskas@amd.com) --- I think you're referencing this patch:
https://patchwork.freedesktop.org/patch/238065/
Which should be fixed in 4.18.
Please post a new ticket with a full dmesg log, Xorg log and your distro/desktop environment if you can still reproduce the problem.