diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 53b706154c94..ed9786241307 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3822,8 +3822,13 @@ static u16 intel_get_ddb_size(struct drm_i915_private *dev_priv,
 
 	/*
 	 * 12GB/s is maximum BW supported by single DBuf slice.
+	 *
+	 * FIXME dbuf slice code is broken:
+	 * - must wait for planes to stop using the slice before powering it off
+	 * - plane straddling both slices is illegal in multi-pipe scenarios
+	 * - should validate we stay within the hw bandwidth limits
 	 */
-	if (num_active > 1 || total_data_bw >= GBps(12)) {
+	if (0 && (num_active > 1 || total_data_bw >= GBps(12))) {
 		ddb->enabled_slices = 2;
 	} else {
 		ddb->enabled_slices = 1;