A sure way to tell if accel works on any GPU is to see if you get opacity on the finder (side bar, dock, window panes etc.). If not accelerated, you get solid black or white surfaces there.
In addition to the energy saver system settings (where you can specify to always use the more powerful GPU if you have two in your system) there are good tools like gfxCardStatus to set this permanently or switch on the fly.
i tested the hybrid patch, does it enable the graphics accel, or just fix the opacity?