Toshiba P55T-B5340 UHD installing el capitan 10.11.3

how to change the pciclass on this amd graphic r9 m265x 2GB? I never disable the amd with dsdt, but it automatic disable by pciclass with 038000. Normally its 030000. I cosmetics my intel HD 4600 to Iris Pro with dsdt.
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Sorry for my Bad English