diff --git a/ChangeLog b/ChangeLog
index 473395326..7364a1007 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,6 @@
+2007-11-11  Pierre Willenbrock <pierre@pirsoft.dnsalias.org>
+	* backend/genesys_gl841.c: add check for low brightness
+
 2007-11-11  Pierre Willenbrock <pierre@pirsoft.dnsalias.org>
 	* backend/genesys.c, backend/genesys_gl646.c,
 	  backend/genesys_gl841.c, backend/genesys_low.h: change 
diff --git a/backend/genesys_gl841.c b/backend/genesys_gl841.c
index af74bf0d1..eae7f1882 100644
--- a/backend/genesys_gl841.c
+++ b/backend/genesys_gl841.c
@@ -4863,6 +4863,25 @@ gl841_coarse_gain_calibration (Genesys_Device * dev, int dpi)
 	   j, max[j], gain[j],dev->frontend.gain[j]);
     }
 
+  for (j = 0; j < channels; j++)
+    {
+      if(gain[j] > 10) 
+        {
+	  DBG (DBG_error0, "**********************************************\n");
+	  DBG (DBG_error0, "**********************************************\n");
+	  DBG (DBG_error0, "****                                      ****\n");
+	  DBG (DBG_error0, "****  Extremely low Brightness detected.  ****\n");
+	  DBG (DBG_error0, "****  Check the scanning head is          ****\n");
+	  DBG (DBG_error0, "****  unlocked and moving.                ****\n");
+	  DBG (DBG_error0, "****                                      ****\n");
+	  DBG (DBG_error0, "**********************************************\n");
+	  DBG (DBG_error0, "**********************************************\n");
+	    
+	  return SANE_STATUS_JAMMED;/* in search for something better */
+        }
+	
+    }
+
   if (dev->model->is_cis) {
       if (dev->frontend.gain[0] > dev->frontend.gain[1])
 	  dev->frontend.gain[0] = dev->frontend.gain[1];