diff --git a/backend/genesys_gl124.cc b/backend/genesys_gl124.cc
index 8cfc6593d..459456aea 100644
--- a/backend/genesys_gl124.cc
+++ b/backend/genesys_gl124.cc
@@ -1247,8 +1247,6 @@ static void gl124_init_scan_regs(Genesys_Device* dev, const Genesys_Sensor& sens
     oflags |= OPTICAL_FLAG_DISABLE_GAMMA;
   if (params.flags & SCAN_FLAG_DISABLE_LAMP)
     oflags |= OPTICAL_FLAG_DISABLE_LAMP;
-  if (params.flags & SCAN_FLAG_CALIBRATION)
-    oflags |= OPTICAL_FLAG_DISABLE_DOUBLE;
 
   if (dev->model->is_cis && dev->settings.true_gray)
     {
diff --git a/backend/genesys_gl843.cc b/backend/genesys_gl843.cc
index 53084b446..4d8d60ab0 100644
--- a/backend/genesys_gl843.cc
+++ b/backend/genesys_gl843.cc
@@ -1307,16 +1307,12 @@ static void gl843_compute_session(Genesys_Device* dev, ScanSession& s,
 
     s.optical_resolution = sensor.optical_res / s.ccd_size_divisor;
 
-    if (s.params.flags & SCAN_FLAG_USE_OPTICAL_RES) {
+    // resolution is choosen from a fixed list and can be used directly
+    // unless we have ydpi higher than sensor's maximum one
+    if (s.params.xres > s.optical_resolution)
         s.output_resolution = s.optical_resolution;
-    } else {
-        // resolution is choosen from a fixed list and can be used directly
-        // unless we have ydpi higher than sensor's maximum one
-        if (s.params.xres > s.optical_resolution)
-            s.output_resolution = s.optical_resolution;
-        else
-            s.output_resolution = s.params.xres;
-    }
+    else
+        s.output_resolution = s.params.xres;
 
     // compute rounded up number of optical pixels
     s.optical_pixels = (s.params.pixels * s.optical_resolution) / s.params.xres;
@@ -1382,8 +1378,6 @@ static void gl843_init_scan_regs(Genesys_Device* dev, const Genesys_Sensor& sens
     oflags |= OPTICAL_FLAG_DISABLE_GAMMA;
   if (session.params.flags & SCAN_FLAG_DISABLE_LAMP)
     oflags |= OPTICAL_FLAG_DISABLE_LAMP;
-  if (session.params.flags & SCAN_FLAG_CALIBRATION)
-    oflags |= OPTICAL_FLAG_DISABLE_DOUBLE;
   if (session.num_staggered_lines)
     oflags |= OPTICAL_FLAG_STAGGER;
   if (session.params.flags & SCAN_FLAG_USE_XPA)
diff --git a/backend/genesys_gl843.h b/backend/genesys_gl843.h
index 1f936a20b..8306fc1ae 100644
--- a/backend/genesys_gl843.h
+++ b/backend/genesys_gl843.h
@@ -378,7 +378,6 @@
 #define SCAN_FLAG_DISABLE_GAMMA            0x004
 #define SCAN_FLAG_DISABLE_BUFFER_FULL_MOVE 0x008
 #define SCAN_FLAG_IGNORE_LINE_DISTANCE     0x010
-#define SCAN_FLAG_USE_OPTICAL_RES          0x020
 #define SCAN_FLAG_DISABLE_LAMP             0x040
 #define SCAN_FLAG_DYNAMIC_LINEART          0x080
 
diff --git a/backend/genesys_gl846.cc b/backend/genesys_gl846.cc
index c9701d02b..6f86eb75f 100644
--- a/backend/genesys_gl846.cc
+++ b/backend/genesys_gl846.cc
@@ -218,8 +218,6 @@ static void gl846_setup_sensor(Genesys_Device * dev, const Genesys_Sensor& senso
   int dpihw;
   uint16_t exp;
 
-    dpihw = sensor.get_register_hwdpi(dpi);
-
     for (uint16_t addr = 0x16; addr < 0x1e; addr++) {
         regs->set8(addr, sensor.custom_regs.get_value(addr));
     }
diff --git a/backend/genesys_low.h b/backend/genesys_low.h
index 3708e7ed6..7d5a8ac0c 100644
--- a/backend/genesys_low.h
+++ b/backend/genesys_low.h
@@ -395,7 +395,6 @@ typedef struct {
 #define OPTICAL_FLAG_DISABLE_SHADING        0x02 /**< disable shading correction */
 #define OPTICAL_FLAG_DISABLE_LAMP           0x04 /**< turn off lamp */
 #define OPTICAL_FLAG_ENABLE_LEDADD          0x08 /**< enable true CIS gray by enabling LED addition */
-#define OPTICAL_FLAG_DISABLE_DOUBLE         0x10 /**< disable automatic x-direction double data expansion */
 #define OPTICAL_FLAG_STAGGER                0x20 /**< disable stagger correction */
 #define OPTICAL_FLAG_USE_XPA                0x40 /**< use XPA lamp rather than regular one */