diff --git a/firmware/main/desklock_main.c b/firmware/main/desklock_main.c
index 2e036f5..fbde868 100644
--- a/firmware/main/desklock_main.c
+++ b/firmware/main/desklock_main.c
@@ -142,7 +142,18 @@ void app_main(void)
 
     s_events = xQueueCreate(8, sizeof(app_event_t));
 
-    bsp_display_start();
+    /* TRIPLE_FULL, not the BSP default TRIPLE_PARTIAL: on IDF 5.5 the DSI driver
+     * lacks the on_frame_buf_complete callback, so PARTIAL mode falls back to a
+     * per-refresh "fake vsync" that over-releases the scanout buffer when a frame
+     * takes >1 refresh to draw (heavy rain + always-on WakeNet) -> tearing/flicker.
+     * TRIPLE_FULL is submit-gated even without that callback. Same 3 framebuffers. */
+    bsp_display_cfg_t disp_cfg = {
+        .lv_adapter_cfg = ESP_LV_ADAPTER_DEFAULT_CONFIG(),
+        .rotation = ESP_LV_ADAPTER_ROTATE_0,
+        .tear_avoid_mode = ESP_LV_ADAPTER_TEAR_AVOID_MODE_TRIPLE_FULL,
+        .touch_flags = { .swap_xy = 0, .mirror_x = 0, .mirror_y = 0 },
+    };
+    bsp_display_start_with_config(&disp_cfg);
     bsp_display_backlight_on();
     face_init();