Index: sys/dev/vt/hw/fb/vt_fb.c
===================================================================
--- sys/dev/vt/hw/fb/vt_fb.c
+++ sys/dev/vt/hw/fb/vt_fb.c
@@ -121,6 +121,11 @@
 		vd->vd_driver->vd_blank(vd, TC_BLACK);
 		break;
 
+	case FBIO_GETRGBOFFS:
+		memcpy((struct fb_rgboffs *)data, &info->fb_rgboffs,
+		    sizeof(struct fb_rgboffs));
+		break;
+
 	default:
 		error = ENOIOCTL;
 		break;
Index: sys/dev/vt/hw/ofwfb/ofwfb.c
===================================================================
--- sys/dev/vt/hw/ofwfb/ofwfb.c
+++ sys/dev/vt/hw/ofwfb/ofwfb.c
@@ -301,7 +301,7 @@
 ofwfb_initialize(struct vt_device *vd)
 {
 	struct ofwfb_softc *sc = vd->vd_softc;
-	int i, err;
+	int i, err, r, g, b;
 	cell_t retval;
 
 	sc->fb.fb_cmsize = 16;
@@ -358,19 +358,21 @@
 		TUNABLE_INT_FETCH("hw.ofwfb.argb32_pixel", &sc->argb);
 		if (sc->endian_flip) {
 			if (sc->argb)
-				vt_generate_cons_palette(sc->fb.fb_cmap,
-				    COLOR_FORMAT_RGB, 255, 8, 255, 16, 255, 24);
+				r = 8, g = 16, b = 24;
 			else
-				vt_generate_cons_palette(sc->fb.fb_cmap,
-				    COLOR_FORMAT_RGB, 255, 24, 255, 16, 255, 8);
+				r = 24, g = 16, b = 8;
 		} else {
 			if (sc->argb)
-				vt_generate_cons_palette(sc->fb.fb_cmap,
-				    COLOR_FORMAT_RGB, 255, 16, 255, 8, 255, 0);
+				r = 16, g = 8, b = 0;
 			else
-				vt_generate_cons_palette(sc->fb.fb_cmap,
-				    COLOR_FORMAT_RGB, 255, 0, 255, 8, 255, 16);
+				r = 0, g = 8, b = 16;
 		}
+		vt_generate_cons_palette(sc->fb.fb_cmap,
+		    COLOR_FORMAT_RGB, 255, r, 255, g, 255, b);
+
+		sc->fb.fb_rgboffs.red = r;
+		sc->fb.fb_rgboffs.green = g;
+		sc->fb.fb_rgboffs.blue = b;
 		break;
 
 	default:
Index: sys/dev/vt/vt_core.c
===================================================================
--- sys/dev/vt/vt_core.c
+++ sys/dev/vt/vt_core.c
@@ -2511,6 +2511,7 @@
 	case FBIO_GETDISPSTART:	/* get display start address */
 	case FBIO_GETLINEWIDTH:	/* get scan line width in bytes */
 	case FBIO_BLANK:	/* blank display */
+	case FBIO_GETRGBOFFS:	/* get RGB offsets */
 		if (vd->vd_driver->vd_fb_ioctl)
 			return (vd->vd_driver->vd_fb_ioctl(vd, cmd, data, td));
 		break;
Index: sys/sys/fbio.h
===================================================================
--- sys/sys/fbio.h
+++ sys/sys/fbio.h
@@ -110,6 +110,15 @@
 #define	FBTYPE_GET_BPP(_fb)	((_fb)->fb_bpp)
 #define	FBTYPE_GET_BYTESPP(_fb)	((_fb)->fb_bpp / 8)
 
+/*
+ * RGB offsets as returned by FBIO_GETRGBOFFS.
+ */
+struct fb_rgboffs {
+	int		red;
+	int		green;
+	int		blue;
+};
+
 #ifdef	_KERNEL
 
 struct fb_info;
@@ -148,6 +157,8 @@
 	int		fb_stride;
 	int		fb_bpp;		/* bits per pixel */
 	uint32_t	fb_cmap[16];
+
+	struct fb_rgboffs fb_rgboffs;	/* RGB offsets */
 };
 
 int fbd_list(void);
@@ -619,4 +630,7 @@
 
 #define FBIO_BLANK	_IOW('F', 115, int)
 
+/* get RGB offsets */
+#define	FBIO_GETRGBOFFS	_IOR('F', 116, struct fb_rgboffs)
+
 #endif /* !_SYS_FBIO_H_ */