From 321537ee92e2a9eeb115434181c12b4ccf8f9ef9 Mon Sep 17 00:00:00 2001
From: Scott Anderson <scott@anderso.nz>
Date: Mon, 27 Apr 2020 11:09:48 +0200
Subject: backend/drm: don't allow legacy to use direct scanout

---
 backend/drm/drm.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index 8efc9d7f..89d89c03 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -373,6 +373,13 @@ static bool test_buffer(struct wlr_drm_connector *conn,
 		return false;
 	}
 
+	/* Legacy never gets to have nice things. But I doubt this would ever work,
+	 * and there is no reliable way to try, without risking messing up the
+	 * modesetting state. */
+	if (drm->iface == &legacy_iface) {
+		return false;
+	}
+
 	struct wlr_drm_crtc *crtc = conn->crtc;
 	if (!crtc) {
 		return false;
-- 
cgit v1.2.3