diff --git a/headers/private/graphics/intel_extreme/intel_extreme.h b/headers/private/graphics/intel_extreme/intel_extreme.h
index 30fbd29957..4534a76703 100644
--- a/headers/private/graphics/intel_extreme/intel_extreme.h
+++ b/headers/private/graphics/intel_extreme/intel_extreme.h
@@ -510,10 +510,11 @@ struct intel_free_graphics_memory {
 #define GEN4_HDMI_PORT_C				(0x1160 | REGS_NORTH_PIPE_AND_PORT)
 #define CHV_HDMI_PORT_D					(0x116C | REGS_NORTH_PIPE_AND_PORT)
 
+// DP_A always @ 6xxxx, DP_B-DP_D move with PCH
 #define INTEL_DISPLAY_PORT_A			(0x4000 | REGS_NORTH_PIPE_AND_PORT)
-#define INTEL_DISPLAY_PORT_B			(0x4100 | REGS_NORTH_PIPE_AND_PORT)
-#define INTEL_DISPLAY_PORT_C			(0x4200 | REGS_NORTH_PIPE_AND_PORT)
-#define INTEL_DISPLAY_PORT_D			(0x4300 | REGS_NORTH_PIPE_AND_PORT)
+#define INTEL_DISPLAY_PORT_B			(0x4100 | REGS_SOUTH_TRANSCODER_PORT)
+#define INTEL_DISPLAY_PORT_C			(0x4200 | REGS_SOUTH_TRANSCODER_PORT)
+#define INTEL_DISPLAY_PORT_D			(0x4300 | REGS_SOUTH_TRANSCODER_PORT)
 
 // planes
 #define INTEL_PIPE_ENABLED				(1UL << 31)