--- xf86-video-nouveau/src/nv_output-old.c	2009-01-05 22:31:49.000000000 +0800
+++ xf86-video-nouveau/src/nv_output.c	2009-01-08 22:03:32.000000000 +0800
@@ -673,6 +673,8 @@
 	xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
 	int i;
 
+	backlightenable(pScrn, mode);
+
 	if (mode == DPMSModeOn) {
 		nv_crtc = to_nouveau_crtc(crtc);
 		regp = &pNv->ModeReg.crtc_reg[nv_crtc->head];
--- xf86-video-nouveau/src/nv_bios-old.c	2009-01-05 22:31:30.000000000 +0800
+++ xf86-video-nouveau/src/nv_bios.c	2009-01-08 11:56:22.000000000 +0800
@@ -2754,23 +2754,33 @@
 	if (script == LVDS_PANEL_OFF)
 		/* off-on delay in ms */
 		BIOS_USLEEP(le16_to_cpu(*(uint16_t *)&bios->data[bios->fp.xlated_entry + 7]));
+
+#ifdef __powerpc__
+        /* Powerbook specific quirks */
+        if (script == LVDS_RESET && ((pNv->Chipset & 0xffff) == 0x0179 || (pNv->Chipset & 0xffff) == 0x0329))
+                nv_write_tmds(pNv, dcbent->or, 0, 0x02, 0x72);
+#endif 
+	return 0;
+}
+
+void backlightenable(ScrnInfoPtr pScrn, int mode)
+{
+	NVPtr pNv = NVPTR(pScrn);
+
 #ifdef __powerpc__
 	/* Powerbook specific quirks */
-	if (script == LVDS_RESET && ((pNv->Chipset & 0xffff) == 0x0179 || (pNv->Chipset & 0xffff) == 0x0329))
-		nv_write_tmds(pNv, dcbent->or, 0, 0x02, 0x72);
 	if ((pNv->Chipset & 0xffff) == 0x0179 || (pNv->Chipset & 0xffff) == 0x0189 || (pNv->Chipset & 0xffff) == 0x0329) {
-		if (script == LVDS_PANEL_ON) {
+		if (mode ==  DPMSModeOn) {
 			nv32_wr(pScrn, NV_PBUS_DEBUG_DUALHEAD_CTL, nv32_rd(pScrn, NV_PBUS_DEBUG_DUALHEAD_CTL) | (1 << 31));
 			nv32_wr(pScrn, NV_CRTC_GPIO_EXT, nv32_rd(pScrn, NV_CRTC_GPIO_EXT) | 1);
 		}
-		if (script == LVDS_PANEL_OFF) {
+		if (mode == DPMSModeOff) {
 			nv32_wr(pScrn, NV_PBUS_DEBUG_DUALHEAD_CTL, nv32_rd(pScrn, NV_PBUS_DEBUG_DUALHEAD_CTL) & ~(1 << 31));
 			nv32_wr(pScrn, NV_CRTC_GPIO_EXT, nv32_rd(pScrn, NV_CRTC_GPIO_EXT) & ~3);
 		}
 	}
 #endif
 
-	return 0;
 }
 
 static int run_lvds_table(ScrnInfoPtr pScrn, struct dcb_entry *dcbent, int head, enum LVDS_script script, int pxclk)
--- xf86-video-nouveau/src/nv_proto-old.h	2009-01-08 22:07:18.000000000 +0800
+++ xf86-video-nouveau/src/nv_proto.h	2009-01-08 11:57:13.000000000 +0800
@@ -77,6 +77,7 @@
 int getMNP_single(ScrnInfoPtr pScrn, struct pll_lims *pll_lim, int clk, int *NM, int *log2P);
 int getMNP_double(ScrnInfoPtr pScrn, struct pll_lims *pll_lim, int clk, int *NM1, int *NM2, int *log2P);
 int get_pll_limits(ScrnInfoPtr pScrn, uint32_t limit_match, struct pll_lims *pll_lim);
+void backlightenable(ScrnInfoPtr pScrn, int mode);
 
 /* nv_crtc.c */
 void NVCrtcSetBase(xf86CrtcPtr crtc, int x, int y);