diff --git a/src/acpi.c b/src/acpi.c
index 2a20756c2..b11ea1242 100644
--- a/src/acpi.c
+++ b/src/acpi.c
@@ -1134,7 +1134,8 @@ acpi_reset(void *priv)
     int i;
 
     memset(&dev->regs, 0x00, sizeof(acpi_regs_t));
-    dev->regs.gpireg[0] = dev->regs.gpireg[1] = dev->regs.gpireg[2] = 0xff;
+    dev->regs.gpireg[0] = 0xff; dev->regs.gpireg[1] = 0xff;
+    dev->regs.gpireg[2] = 0xf3;	/* SMSC: Bit 2: 80-conductor cable on primary IDE (0 = yes, 1 = no), Bit 3: on secondary IDE. */
     for (i = 0; i < 4; i++)
 	dev->regs.gporeg[i] = dev->gporeg_default[i];
     if (dev->vendor == VEN_VIA_596B) {
diff --git a/src/chipset/intel_piix.c b/src/chipset/intel_piix.c
index 2557c8a80..85448bdde 100644
--- a/src/chipset/intel_piix.c
+++ b/src/chipset/intel_piix.c
@@ -1053,8 +1053,8 @@ piix_reset_hard(piix_t *dev)
     }
     fregs[0x20] = 0x01;
     if (dev->type == 5) {
-	fregs[0x3c] = 0x0e;
-	fregs[0x3d] = 0x01;
+	fregs[0x3c] = 0x0e; fregs[0x3d] = 0x01;
+	fregs[0x45] = 0x55; fregs[0x46] = 0x01;
     }
     if ((dev->type == 1) && (dev->rev == 2))
 	dev->max_func = 0;		/* It starts with IDE disabled, then enables it. */
diff --git a/src/video/vid_s3_virge.c b/src/video/vid_s3_virge.c
index b01d2e710..ab9ebc8c5 100644
--- a/src/video/vid_s3_virge.c
+++ b/src/video/vid_s3_virge.c
@@ -2784,7 +2784,7 @@ static void tri(virge_t *virge, s3d_t *s3d_tri, s3d_state_t *state, int yc, int3
                         state->x1 += (dx1 * diff_y);
                         state->x2 += (dx2 * diff_y);
                         state->y -= diff_y;
-                        dest_offset -= s3d_tri->dest_str;
+                        dest_offset -= s3d_tri->dest_str * diff_y;
                         z_offset -= s3d_tri->z_str;
                         y_count -= diff_y;
                 }