as a fellow laptop user, the primary display gpu of the system can be set, the only way i know if to change this, is to get into the bios, and disable the intel gpu. normally i advise others NOT to fiddle with the bios due to the fact one key stroke can change things and cause a whore mess of problems, if you're careless or clueless, but, in this case, it's the only way i know, or can think of to fix this.

again, usually NOT adived, but, only thing i can think of..