SDVO_CMD_GET_BRIGHTNESS  649 drivers/gpu/drm/gma500/psb_intel_sdvo_regs.h #define SDVO_CMD_GET_BRIGHTNESS				0x5c
SDVO_CMD_GET_BRIGHTNESS  660 drivers/gpu/drm/i915/display/intel_sdvo_regs.h #define SDVO_CMD_GET_BRIGHTNESS				0x5c