https://bugzilla.kernel.org/show_bug.cgi?id=199959
--- Comment #4 from Alexander Mezin (mezin.alexander@gmail.com) --- Commit d6895ad39f3b396be199f5b6fdfb8cde4be7bbf7 seems to be the cause. Resume works on 4.16 if I revert that single commit (tested on 4.16.0, 4.16.13, with both amdgpu.dc=0 and amdgpu.dc=1).