https://bugzilla.kernel.org/show_bug.cgi?id=200809
--- Comment #2 from Jaya Balan Aaron (bucket.size@gmail.com) --- Problem is with kernel 4.18.0-rc8 build from a 3rd party => https://github.com/M-Bab/linux-kernel-amdgpu-binaries.
Not sure if the amd-staging-drm-next is in it. It only says: "Kernel source code of amd-staging with DAL and latest security patches". So I doubt it has "amd-staging-drm-next".
Seems like 4.18.1 is latest stable, will compile that myself tonight and check if i'm able to reproduce.
Will get back with more details.