diff --git a/backend/genesys_gl124.cc b/backend/genesys_gl124.cc
index 57e9d1510..7e3bb542b 100644
--- a/backend/genesys_gl124.cc
+++ b/backend/genesys_gl124.cc
@@ -947,9 +947,6 @@ static void gl124_init_optical_regs_scan(Genesys_Device* dev, const Genesys_Sens
 
   dev->line_count = 0;
 
-  DBG (DBG_io2, "%s: pixels          =%d\n", __func__, session.optical_pixels);
-  DBG (DBG_io2, "%s: depth           =%d\n", __func__, session.params.depth);
-
     build_image_pipeline(dev, session);
 
     // MAXWD is expressed in 2 words unit
@@ -1001,8 +998,6 @@ static void gl124_init_scan_regs(Genesys_Device* dev, const Genesys_Sensor& sens
   int slope_dpi = 0;
   int scan_step_type = 1;
 
-    DBG (DBG_info, "%s: optical_res=%d\n", __func__, session.optical_resolution);
-
     /* cis color scan is effectively a gray scan with 3 gray lines per color line and a FILTER of 0 */
     if (dev->model->is_cis) {
         slope_dpi = session.params.yres * session.params.channels;
@@ -1114,8 +1109,6 @@ gl124_calculate_current_setup (Genesys_Device * dev, const Genesys_Sensor& senso
   /* pixels are allways given at half or full CCD optical resolution */
   /* use detected left margin  and fixed value */
 
-    DBG(DBG_info, "%s: used_pixels=%d\n", __func__, session.optical_pixels);
-
     exposure_time = get_sensor_profile(dev->model->asic_type, sensor, session.params.xres,
                                        session.ccd_size_divisor).exposure_lperiod;
 
diff --git a/backend/genesys_gl843.cc b/backend/genesys_gl843.cc
index 727a91734..f962aa08d 100644
--- a/backend/genesys_gl843.cc
+++ b/backend/genesys_gl843.cc
@@ -1159,9 +1159,6 @@ static void gl843_init_optical_regs_scan(Genesys_Device* dev, const Genesys_Sens
     reg->set16(REG_STRPIXEL, session.pixel_startx);
     reg->set16(REG_ENDPIXEL, session.pixel_endx);
 
-  DBG(DBG_io2, "%s: pixels     =%d\n", __func__, session.optical_pixels);
-  DBG(DBG_io2, "%s: depth      =%d\n", __func__, session.params.depth);
-
   /* MAXWD is expressed in 2 words unit */
   /* nousedspace = (mem_bank_range * 1024 / 256 -1 ) * 4; */
     // BUG: the division by ccd_size_divisor likely does not make sense
@@ -1225,8 +1222,6 @@ static void gl843_init_scan_regs(Genesys_Device* dev, const Genesys_Sensor& sens
   int dummy = 0;
   int scan_step_type = 1;
 
-  DBG(DBG_info, "%s : stagger=%d lines\n", __func__, session.num_staggered_lines);
-
   /* we enable true gray for cis scanners only, and just when doing
    * scan since color calibration is OK for this mode
    */
diff --git a/backend/genesys_gl846.cc b/backend/genesys_gl846.cc
index 7b0d3006b..61f5cda13 100644
--- a/backend/genesys_gl846.cc
+++ b/backend/genesys_gl846.cc
@@ -816,9 +816,6 @@ static void gl846_init_optical_regs_scan(Genesys_Device* dev, const Genesys_Sens
     DBG(DBG_io2, "%s: startx=%d\n", __func__, startx / ccd_pixels_per_system_pixel);
     DBG(DBG_io2, "%s: endx  =%d\n", __func__, endx / ccd_pixels_per_system_pixel);
 
-  DBG (DBG_io2, "%s: pixels     =%d\n", __func__, session.optical_pixels);
-  DBG (DBG_io2, "%s: depth      =%d\n", __func__, session.params.depth);
-
     build_image_pipeline(dev, session);
 
   /* MAXWD is expressed in 4 words unit */
diff --git a/backend/genesys_gl847.cc b/backend/genesys_gl847.cc
index 21ea22ea2..fafaece2a 100644
--- a/backend/genesys_gl847.cc
+++ b/backend/genesys_gl847.cc
@@ -833,9 +833,6 @@ static void gl847_init_optical_regs_scan(Genesys_Device* dev, const Genesys_Sens
     DBG(DBG_io2, "%s: startx=%d\n", __func__, startx / ccd_pixels_per_system_pixel);
     DBG(DBG_io2, "%s: endx  =%d\n", __func__, endx / ccd_pixels_per_system_pixel);
 
-  DBG (DBG_io2, "%s: pixels     =%d\n", __func__, session.optical_pixels);
-  DBG (DBG_io2, "%s: depth      =%d\n", __func__, session.params.depth);
-
     build_image_pipeline(dev, session);
 
   /* MAXWD is expressed in 4 words unit */