diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 2300ab1..cf85155 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -277,6 +277,12 @@
 	case DRM_CAP_VBLANK_HIGH_CRTC:
 		req->value = 1;
 		break;
+	case DRM_CAP_DUMB_PREFERRED_DEPTH:
+		req->value = dev->mode_config.preferred_depth;
+		break;
+	case DRM_CAP_DUMB_PREFER_SHADOW:
+		req->value = dev->mode_config.prefer_shadow;
+		break;
 	default:
 		return -EINVAL;
 	}
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index dfa6744..0a8a640 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9089,6 +9089,9 @@
 	dev->mode_config.min_width = 0;
 	dev->mode_config.min_height = 0;
 
+	dev->mode_config.preferred_depth = 24;
+	dev->mode_config.prefer_shadow = 1;
+
 	dev->mode_config.funcs = (void *)&intel_mode_funcs;
 
 	intel_init_quirks(dev);
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index 5515f10..7cb062d 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -1240,6 +1240,9 @@
 		rdev->ddev->mode_config.max_height = 4096;
 	}
 
+	rdev->ddev->mode_config.preferred_depth = 24;
+	rdev->ddev->mode_config.prefer_shadow = 1;
+
 	rdev->ddev->mode_config.fb_base = rdev->mc.aper_base;
 
 	ret = radeon_modeset_create_props(rdev);