Disable r6 graphics on a A10-7300

Hi,

 

I'm running Win10 64 bits on a HP laptop. I would like to disable r6 graphics on my A10-7300, to be sure the system uses only the other GPU, a R7 M260.

I did not find any setting I could use for it in the BIOS, is there any other option to do it ?

 

Thank you