backend/drm: refuse to enable an output without a mode
@@ -422,6 +422,15 @@ static bool test_buffer(struct wlr_drm_connector *conn,
static bool drm_connector_test(struct wlr_output *output) {
struct wlr_drm_connector *conn = get_drm_connector_from_output(output);
+ if ((output->pending.committed & WLR_OUTPUT_STATE_ENABLED) &&
+ output->pending.enabled) {
+ if (output->current_mode == NULL &&
+ !(output->pending.committed & WLR_OUTPUT_STATE_MODE)) {
+ wlr_log(WLR_DEBUG, "Can't enable an output without a mode");
+ return false;
+ }
+ }
+
if ((output->pending.committed & WLR_OUTPUT_STATE_BUFFER) &&
output->pending.buffer_type == WLR_OUTPUT_STATE_BUFFER_SCANOUT) {
if (!test_buffer(conn, output->pending.buffer)) {
