usFBUsedByDrvInKb 4349 drivers/gpu/drm/amd/include/atombios.h   USHORT  usFBUsedByDrvInKb;
usFBUsedByDrvInKb 3866 drivers/gpu/drm/radeon/atombios.h   USHORT  usFBUsedByDrvInKb;