Are you checking radeon_pm_info while the app is running?  E.g., via ssh or via
another X terminal?  If you switch to another VT or something like that there
will not be any activity.  Can you try is with something simple like glxgears? 
E.g., run `vblank_mode=0 glxgears -fullscreen` and then check radeon_pm_info
via ssh while gears is running.