https://bugs.freedesktop.org/show_bug.cgi?id=92936
--- Comment #19 from Andy Furniss adf.lists@gmail.com --- Thought I'd already done this one but apparently not.
cat /sys/kernel/debug/dri/64/amdgpu_pm_info
Ever since this option appeared, so before powergating was disabled/clockgating enabled and currently. VCE is always shown as enabled. UVD behaves and only says enabled when in use.