From fa9f5370b2c2babfd63e8442ecff0f567053898f Mon Sep 17 00:00:00 2001
From: Povilas Kanapickas <povilas@radix.lt>
Date: Fri, 21 Feb 2020 22:40:15 +0200
Subject: [PATCH] genesys: Turn off offset calibration on 4400F

---
 backend/genesys/gl843.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/backend/genesys/gl843.cpp b/backend/genesys/gl843.cpp
index 96a4ac037..b9899c9dc 100644
--- a/backend/genesys/gl843.cpp
+++ b/backend/genesys/gl843.cpp
@@ -1928,6 +1928,12 @@ void CommandSetGl843::offset_calibration(Genesys_Device* dev, const Genesys_Sens
         target_pixels = static_cast<int>((size * resolution) / MM_PER_INCH);
     }
 
+    if (dev->model->model_id == ModelId::CANON_4400F &&
+        dev->settings.scan_method == ScanMethod::FLATBED)
+    {
+        return;
+    }
+
     ScanFlag flags = ScanFlag::DISABLE_SHADING |
                      ScanFlag::DISABLE_GAMMA |
                      ScanFlag::SINGLE_LINE |