https://bugs.freedesktop.org/show_bug.cgi?id=110671
--- Comment #7 from Tomas Bzatek bugs@bzatek.net --- The offending commit is
commit 5fc0cbfad4564856ee0f323d3f88a7cff19cc3f1 Author: Wenjing Liu Wenjing.Liu@amd.com Date: Fri Jan 18 18:19:51 2019 -0500
drm/amd/display: determine if a pipe is synced by plane state