SDVO_LVDS_DUAL_CHANNEL  637 drivers/gpu/drm/gma500/psb_intel_sdvo_regs.h # define SDVO_LVDS_DUAL_CHANNEL				(1 << 4)
SDVO_LVDS_DUAL_CHANNEL  648 drivers/gpu/drm/i915/display/intel_sdvo_regs.h # define SDVO_LVDS_DUAL_CHANNEL				(1 << 4)