diff --git a/drivers/gpu/drm/nouveau/core/subdev/bios/base.c b/drivers/gpu/drm/nouveau/core/subdev/bios/base.c
index 5d71115..619e7e0 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/bios/base.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/bios/base.c
@@ -199,7 +199,8 @@ nouveau_bios_shadow_acpi(struct nouveau_bios *bios)
 	if (bios->data) {
 		/* disobey the acpi spec - much faster on at least w530 ... */
 		ret = nouveau_acpi_get_bios_chunk(bios->data, 0, bios->size);
-		if (ret != bios->size) {
+		if (ret != bios->size ||
+		    nvbios_checksum(bios->data, bios->size)) {
 			/* ... that didn't work, ok, i'll be good now */
 			for (i = 0; i < bios->size; i += cnt) {
 				cnt = min((bios->size - i), (u32)4096);