https://bugs.freedesktop.org/show_bug.cgi?id=106306
--- Comment #1 from grmat@sub.red --- Overdrive doesn't work either with current stable kernel (4.16.6). Clock remains stable (as seen in amdgpu_pm_info) and reading the value gives 0:
echo 5 | sudo tee /sys/class/drm/card0/device/pp_sclk_od
5
cat /sys/class/drm/card0/device/pp_sclk_od
0
I can't currently tell when this issue appeared or if the feature even ever worked with this hardware, as I've never been using it.