SDVO_CMD_GET_BACKLIGHT_LEVEL  563 drivers/gpu/drm/gma500/psb_intel_sdvo_regs.h #define SDVO_CMD_GET_BACKLIGHT_LEVEL			0x31
SDVO_CMD_GET_BACKLIGHT_LEVEL  574 drivers/gpu/drm/i915/display/intel_sdvo_regs.h #define SDVO_CMD_GET_BACKLIGHT_LEVEL			0x31