What is the result you are expecting? AutoLevel stretches your image to the minimum and maximum of the QuantumRange (0-255 / 0-65535). Your image is already at the minimum and maximum, so it will not be changed.
AutoGamma does change your image but the difference is hardly noticeable:
AutoGamma does change your image but the difference is hardly noticeable:
C:\Test>compare -metric rmse fusca.png fusca2.png null:
232.336 (0.00354522)