ATOM_BIOS_FUNCTION_OLD_DEVICE_SWITCH 8245 drivers/gpu/drm/amd/include/atombios.h #define ATOM_BIOS_FUNCTION_OLD_DEVICE_SWITCH    0x84
ATOM_BIOS_FUNCTION_OLD_DEVICE_SWITCH 6975 drivers/gpu/drm/radeon/atombios.h #define ATOM_BIOS_FUNCTION_OLD_DEVICE_SWITCH    0x84