diff --git a/headers/private/graphics/intel_extreme/intel_extreme.h b/headers/private/graphics/intel_extreme/intel_extreme.h
index a8b5babe6d..0b18fb73c6 100644
--- a/headers/private/graphics/intel_extreme/intel_extreme.h
+++ b/headers/private/graphics/intel_extreme/intel_extreme.h
@@ -857,6 +857,16 @@ struct intel_free_graphics_memory {
 #define INTEL_DISPLAY_PORT_C			(0x4200 | REGS_SOUTH_TRANSCODER_PORT)
 #define INTEL_DISPLAY_PORT_D			(0x4300 | REGS_SOUTH_TRANSCODER_PORT)
 
+#define INTEL_DISP_PORTA_SNB_PIPE_SHIFT	30
+#define INTEL_DISP_PORTA_SNB_PIPE_MASK	(1 << INTEL_DISP_PORTA_SNB_PIPE_SHIFT)
+#define INTEL_DISP_PORTA_SNB_PIPE_A		0
+#define INTEL_DISP_PORTA_SNB_PIPE_B		1
+#define INTEL_DISP_PORTA_IVB_PIPE_SHIFT	29
+#define INTEL_DISP_PORTA_IVB_PIPE_MASK	(3 << INTEL_DISP_PORTA_IVB_PIPE_SHIFT)
+#define INTEL_DISP_PORTA_IVB_PIPE_A		0
+#define INTEL_DISP_PORTA_IVB_PIPE_B		1
+#define INTEL_DISP_PORTA_IVB_PIPE_C		2
+
 #define INTEL_DISP_PORT_WIDTH_SHIFT		19
 #define INTEL_DISP_PORT_WIDTH_MASK		(7 << INTEL_DISP_PORT_WIDTH_SHIFT)
 #define INTEL_DISP_PORT_WIDTH_1			0
diff --git a/src/add-ons/accelerants/intel_extreme/Ports.cpp b/src/add-ons/accelerants/intel_extreme/Ports.cpp
index c7ebdb82f5..30ba369a37 100644
--- a/src/add-ons/accelerants/intel_extreme/Ports.cpp
+++ b/src/add-ons/accelerants/intel_extreme/Ports.cpp
@@ -992,6 +992,28 @@ DisplayPort::PipePreference()
 	uint32 TranscoderPort = INTEL_TRANS_DP_PORT_NONE;
 	switch (PortIndex()) {
 		case INTEL_PORT_A:
+			if (gInfo->shared_info->device_type.Generation() == 6) {
+				if (((read32(INTEL_DISPLAY_PORT_A) & INTEL_DISP_PORTA_SNB_PIPE_MASK)
+					>> INTEL_DISP_PORTA_SNB_PIPE_SHIFT) == INTEL_DISP_PORTA_SNB_PIPE_A) {
+					return INTEL_PIPE_A;
+				} else {
+					return INTEL_PIPE_B;
+				}
+			}
+			if (gInfo->shared_info->device_type.Generation() == 7) {
+				uint32 Pipe = (read32(INTEL_DISPLAY_PORT_A) & INTEL_DISP_PORTA_IVB_PIPE_MASK)
+					>> INTEL_DISP_PORTA_IVB_PIPE_SHIFT;
+				switch (Pipe) {
+					case INTEL_DISP_PORTA_IVB_PIPE_A:
+						return INTEL_PIPE_A;
+					case INTEL_DISP_PORTA_IVB_PIPE_B:
+						return INTEL_PIPE_B;
+					case INTEL_DISP_PORTA_IVB_PIPE_C:
+						return INTEL_PIPE_C;
+					default:
+						return INTEL_PIPE_ANY;
+				}
+			}
 			return INTEL_PIPE_ANY;
 		case INTEL_PORT_B:
 			TranscoderPort = INTEL_TRANS_DP_PORT_B;
diff --git a/src/add-ons/accelerants/intel_extreme/pll.cpp b/src/add-ons/accelerants/intel_extreme/pll.cpp
index 96517b9f0e..b8e08e7f63 100644
--- a/src/add-ons/accelerants/intel_extreme/pll.cpp
+++ b/src/add-ons/accelerants/intel_extreme/pll.cpp
@@ -477,16 +477,23 @@ refclk_activate_ilk(bool hasPanel)
 	bool wantsSSC;
 	bool hasCK505;
 	if (gInfo->shared_info->pch_info == INTEL_PCH_IBX) {
+		TRACE("%s: Generation 5 graphics\n", __func__);
 		//XXX: This should be == vbt display_clock_mode
 		hasCK505 = false;
 		wantsSSC = hasCK505;
 	} else {
+		if (gInfo->shared_info->device_type.Generation() == 6) {
+			TRACE("%s: Generation 6 graphics\n", __func__);
+		} else {
+			TRACE("%s: Generation 7 graphics\n", __func__);
+		}
 		hasCK505 = false;
 		wantsSSC = true;
 	}
 
 	uint32 clkRef = read32(PCH_DREF_CONTROL);
 	uint32 newRef = clkRef;
+	TRACE("%s: PCH_DREF_CONTROL before: 0x%" B_PRIx32 "\n", __func__, clkRef);
 
 	newRef &= ~DREF_NONSPREAD_SOURCE_MASK;
 
@@ -516,6 +523,8 @@ refclk_activate_ilk(bool hasPanel)
 		// Power up SSC before enabling outputs
 		write32(PCH_DREF_CONTROL, newRef);
 		read32(PCH_DREF_CONTROL);
+		TRACE("%s: PCH_DREF_CONTROL after SSC on/off: 0x%" B_PRIx32 "\n",
+				__func__, read32(PCH_DREF_CONTROL));
 		spin(200);
 
 		newRef &= ~DREF_CPU_SOURCE_OUTPUT_MASK;
@@ -531,6 +540,8 @@ refclk_activate_ilk(bool hasPanel)
 
 		write32(PCH_DREF_CONTROL, newRef);
 		read32(PCH_DREF_CONTROL);
+		TRACE("%s: PCH_DREF_CONTROL after done: 0x%" B_PRIx32 "\n",
+				__func__, read32(PCH_DREF_CONTROL));
 		spin(200);
 	} else {
 		newRef &= ~DREF_CPU_SOURCE_OUTPUT_MASK;
@@ -538,6 +549,8 @@ refclk_activate_ilk(bool hasPanel)
 
 		write32(PCH_DREF_CONTROL, newRef);
 		read32(PCH_DREF_CONTROL);
+		TRACE("%s: PCH_DREF_CONTROL after disable CPU output: 0x%" B_PRIx32 "\n",
+				__func__, read32(PCH_DREF_CONTROL));
 		spin(200);
 
 		if (!wantsSSC) {
@@ -547,6 +560,8 @@ refclk_activate_ilk(bool hasPanel)
 
 			write32(PCH_DREF_CONTROL, newRef);
 			read32(PCH_DREF_CONTROL);
+			TRACE("%s: PCH_DREF_CONTROL after disable SSC: 0x%" B_PRIx32 "\n",
+					__func__, read32(PCH_DREF_CONTROL));
 			spin(200);
 		}
 	}