backend/drm: log drm_connector_alloc_crtc() failures

Helps figuring out why e.g. get_primary_formats fails.

1 files changed, 5 insertions, 1 deletions

diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index 40360f17..7b6b5451 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -852,7 +852,11 @@ static bool drm_connector_alloc_crtc(struct wlr_drm_connector *conn) {
 	if (conn->crtc == NULL) {
 		realloc_crtcs(conn->backend, conn);
 	}
-	return conn->crtc != NULL;
+	bool ok = conn->crtc != NULL;
+	if (!ok) {
+		wlr_drm_conn_log(conn, WLR_DEBUG, "Failed to find free CRTC");
+	}
+	return ok;
 }
 
 static struct wlr_drm_mode *drm_mode_create(const drmModeModeInfo *modeinfo) {