(#3729) only connected outputs can be added to the output list

src/platforms/gbm-kms/server/kms/real_kms_output_container.cpp

@@ -14,10 +14,12 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#define MIR_LOG_COMPONENT "gbm-kms"
 #include <algorithm>
 #include "real_kms_output_container.h"
 #include "real_kms_output.h"
 #include "kms-utils/drm_mode_resources.h"
+#include <mir/log.h>
 
 namespace mgg = mir::graphics::gbm;
 
@@ -55,6 +57,12 @@ void mgg::RealKMSOutputContainer::update_from_hardware_state()
                     drm_fd == candidate->drm_fd();
             });
 
+        if (connector->connection != DRM_MODE_CONNECTED)
+        {
+            mir::log_warning("Connector is not connected, so not adding this output to the list.");
+            continue;
+        }
+
         if (existing_output != outputs.end())
         {
             // We could drop this down to O(n) by being smarter about moving out