i have the same issue with m375 , its been like 2 months and still didn't find any solution .. however i think its driver issue. because all the websites shows that the m375 is a good one however the intel integrated out preform it i have been waiting for a solution but i didn't find any....
In AMD Catalyst Control Center
Under Power tab, Switchable Graphics Application Settings. Select High Performance for Graphics Setting. That will choose m375 instead of integrated graphics.
It can add application monitor(Switchable Graphics Application) to add your game or manually add in in "Add Application button"