SDVO_CMD_GET_MAX_BRIGHTNESS  616 drivers/gpu/drm/gma500/psb_intel_sdvo_regs.h #define SDVO_CMD_GET_MAX_BRIGHTNESS			0x5b
SDVO_CMD_GET_MAX_BRIGHTNESS  627 drivers/gpu/drm/i915/display/intel_sdvo_regs.h #define SDVO_CMD_GET_MAX_BRIGHTNESS			0x5b