1 files changed, 9 insertions, 2 deletions

diff --git a/sway/config/output.c b/sway/config/output.c
index 9fff79fd..8e937b28 100644
--- a/sway/config/output.c
+++ b/sway/config/output.c
@@ -406,9 +406,16 @@ static void queue_output_config(struct output_config *oc,
                 wlr_output_set_subpixel(wlr_output, oc->subpixel);
         }
 
+        enum wl_output_transform tr = WL_OUTPUT_TRANSFORM_NORMAL;
         if (oc && oc->transform >= 0) {
-                sway_log(SWAY_DEBUG, "Set %s transform to %d", oc->name, oc->transform);
-                wlr_output_set_transform(wlr_output, oc->transform);
+                tr = oc->transform;
+        } else if (wlr_output_is_drm(wlr_output)) {
+                tr = wlr_drm_connector_get_panel_orientation(wlr_output);
+                sway_log(SWAY_DEBUG, "Auto-detected output transform: %d", tr);
+        }
+        if (wlr_output->transform != tr) {
+                sway_log(SWAY_DEBUG, "Set %s transform to %d", oc->name, tr);
+                wlr_output_set_transform(wlr_output, tr);
         }
 
         // Apply the scale last before the commit, because the scale auto-detection