--- a/sys/dev/drm/radeon/radeon_combios.c
+++ b/sys/dev/drm/radeon/radeon_combios.c
@@ -2887,7 +2887,6 @@
 
 	if (rdev->flags & RADEON_IS_IGP) {
 		offset = combios_get_table_offset(dev, COMBIOS_TMDS_POWER_ON_TABLE);
-		rev = RBIOS8(offset);
 		if (offset) {
 			rev = RBIOS8(offset);
 			if (rev > 1) {