Let's all read carefully:
56.1 (1) Nothing in this section affects the powers of the Governor General, including the power to dissolve Parliament at the Governor General’s discretion.
1. the power or right to decide or act according to one's own judgment; freedom of judgment or choice: It is entirely within my discretion whether I will go or stay.
Yo, Harper: "Madame Governor General, I would like to call an election."
Madame Governor General: "No. Now piss off, you pompous little git."