Fix RAMDAC detection on some IMS TwinTurbo video cards ("Mac" cards only),

without this, you get no display on machines with those cards

drivers/video/imsttfb.c

@@ -1461,6 +1461,15 @@ imsttfb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	unsigned long addr, size;
 	struct imstt_par *par;
 	struct fb_info *info;
+#ifdef CONFIG_PPC_OF
+	struct device_node *dp;
+	
+	dp = pci_device_to_OF_node(pdev);
+	if(dp)
+		printk(KERN_INFO "%s: OF name %s\n",__FUNCTION__, dp->name);
+	else
+		printk(KERN_ERR "imsttfb: no OF node for pci device\n");
+#endif /* CONFIG_PPC_OF */
 
 	size = sizeof(struct fb_info) + sizeof(struct imstt_par) +
 		sizeof(u32) * 16;
@@ -1488,6 +1497,11 @@ imsttfb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	switch (pdev->device) {
 		case PCI_DEVICE_ID_IMS_TT128: /* IMS,tt128mbA */
 			par->ramdac = IBM;
+#ifdef CONFIG_PPC_OF
+			if (dp && ((strcmp(dp->name, "IMS,tt128mb8") == 0) ||
+				   (strcmp(dp->name, "IMS,tt128mb8A") == 0)))
+				par->ramdac = TVP;
+#endif /* CONFIG_PPC_OF */
 			break;
 		case PCI_DEVICE_ID_IMS_TT3D:  /* IMS,tt3d */
 			par->ramdac = TVP;