Index: sources/device/DeviceModels.h
===================================================================
diff -u -rc9f8f8cf3c6c37fc6460d8675c62c9442c4d4263 -rf6b80a12cbbf42bea4448b9f8424350f5496d624
--- sources/device/DeviceModels.h	(.../DeviceModels.h)	(revision c9f8f8cf3c6c37fc6460d8675c62c9442c4d4263)
+++ sources/device/DeviceModels.h	(.../DeviceModels.h)	(revision f6b80a12cbbf42bea4448b9f8424350f5496d624)
@@ -90,11 +90,11 @@
 //        But here it's the same.
     // TODO: improve later - this has to be match with HW2UI in response
     QMap<quint8, quint8> UI2HW = { // the mapping is not linear so has to be mapped to keep the order
-        { 20,  1},
-        { 40,  3},
-        { 60,  5},
-        { 80,  6},
-        {100, 10},
+        { 1,  1}, // "key" is the value accepted from QML mapped to HW
+        { 2,  3},
+        { 3,  5},
+        { 4,  6},
+        { 5, 10},
     };
 public:
     // TODO : these needs to be available in Views
@@ -107,7 +107,7 @@
         quint8 mBrightness_old          = mBrightness_min   ;
         quint8 mBrightness_val          =  0;
 
-        quint8 mBrightnessPercent   = 100;
+        quint8 mBrightnessPercent   = 5; // ~ 100%
         bool   mRead                = false;
     } _data;
 
@@ -124,12 +124,12 @@
  */
 class MDeviceBrightnessResponse : public MDeviceResponseBase {
     // TODO: improve later - this has to be match with UI2HW in request
-    QMap<quint8, quint8> HW2UI = { // the mapping is not linear so has to be mapped to keep the order
-        {  1,  20},
-        {  3,  40},
-        {  5,  60},
-        {  6,  80},
-        { 10, 100},
+    QMap<quint8, quint8> HW2UI = { // the mapping is not linear so has to be mapped to keep the order;
+        {  1,  1}, // "value" is the displayed number in QML for property "brightness"
+        {  3,  2},
+        {  5,  3},
+        {  6,  4},
+        { 10,  5},
     };
 
 public:
Index: sources/gui/qml/pages/settings/SettingsVolumeBrightness.qml
===================================================================
diff -u -r642f08650a7a88ad6a2305fdea6bd18365aab5c7 -rf6b80a12cbbf42bea4448b9f8424350f5496d624
--- sources/gui/qml/pages/settings/SettingsVolumeBrightness.qml	(.../SettingsVolumeBrightness.qml)	(revision 642f08650a7a88ad6a2305fdea6bd18365aab5c7)
+++ sources/gui/qml/pages/settings/SettingsVolumeBrightness.qml	(.../SettingsVolumeBrightness.qml)	(revision f6b80a12cbbf42bea4448b9f8424350f5496d624)
@@ -49,11 +49,11 @@
             Slider { id : _brightness
                 anchors.verticalCenter: parent.verticalCenter
                 width   : 500
-                step    : 20    // no zero
-                minimum : 20    // 1
-                maximum : 100   // 10
+                step    : 1    // no zero
+                minimum : 1    // 1
+                maximum : 5   // 10
                 ticks   : true
-                unit    : qsTr("%")
+                unit    : ""
                 onReleased  : vDevice.brightness = _brightness.value
                 Connections { target: vDevice
                     // in case the value is rejecte it will be set to the previous value
@@ -81,11 +81,11 @@
                 property bool postInit: true
                 anchors.verticalCenter: parent.verticalCenter
                 width   : 500
-                step    : 20    // no zero
-                minimum : 20    // 1
-                maximum : 100   // 5
+                step    : 1    // no zero
+                minimum : 1    // 1
+                maximum : 5   // 5
                 ticks   : true
-                unit    : qsTr("%")
+                unit    : ""
                 onReleased  : {
                     vAdjustmentAlarmVolume.doAdjustment( _alarmVolume.value )
                 }