SDVO_CMD_GET_MAX_BACKLIGHT_LEVEL  557 drivers/gpu/drm/gma500/psb_intel_sdvo_regs.h #define SDVO_CMD_GET_MAX_BACKLIGHT_LEVEL		0x30
SDVO_CMD_GET_MAX_BACKLIGHT_LEVEL  568 drivers/gpu/drm/i915/display/intel_sdvo_regs.h #define SDVO_CMD_GET_MAX_BACKLIGHT_LEVEL		0x30