Index: SDDs/Settings_Popup.png
===================================================================
diff -u
Binary files differ
Index: SDDs/Settings_Popup.puml
===================================================================
diff -u
--- SDDs/Settings_Popup.puml	(revision 0)
+++ SDDs/Settings_Popup.puml	(revision 8144efe22a7a15f19e6e958a40b3360096c84c49)
@@ -0,0 +1,78 @@
+@startuml Settings_Popup
+    participant TD                  as TD
+    participant OS                  as OS
+    participant Script              as Script
+    participant SW                  as SW
+    participant UI                  as UI
+    actor       USER                as US
+
+    'Possible actions and interaction types
+    ' External on CANBus
+    ' TD -> SW: MSG: Message
+    ' SW -> TD: MSG: Message
+
+    ' Internal to the application
+    ' XX -> YY: CMD: Command
+    ' XX -> XX: ACT: Action
+
+    ' External on OS/FS
+    ' SW -> Script: ACT: Command
+    ' Script -> OS: CMD: Command
+    ' Script -> SW: MSG: Message
+    ' OS -> Script: MSG: Message
+
+    ' US -> UI: User actions are:
+    '   ASK: Display a <message>
+    '   ENT: User enters a value or string
+    '   TCH: User touches a button (RadioButton, CheckBox, ...)
+    '   SCL: User scrolls a flip-able area
+
+    == Navigate to popup ==
+    US -> UI: TCH: Press settings headerbar icon button
+    UI -> UI: ACT: Settings Popup is displayed
+
+    == Brightness ==
+    US -> UI: SCL: Brightness Slider
+    UI -> SW: ACT: Request Brightness Update \
+                \n\tonReleased: send slider value
+    SW -> Script: ACT: brightness.sh ( )
+    activate Script
+        Script -> OS: CMD: set BRIGHTNESS SYSFS with updated brightness value
+        OS -> Script: MSG: Current or updated brightness value
+        Script -> SW: MSG: \
+            \n - echo $BRIGHTNESS_VALUE \
+            \n - exit #
+    deactivate Script
+    alt successful ( exit == 0 )
+        SW -> UI: ACT: Send current brightness value set in BRIGHTNESS SYSFS
+        UI -> UI: ACT:                              \
+            \n - Brightness value text updated      \
+            \n - Current slider position verified   
+    else failed
+        SW -> UI: ACT: Script Error
+        UI -> UI: ACT: Undefined brightness value\n\tSlider Reverts or previous position
+        UI -> US: ACT: Notify user
+    end
+
+    == Alarm Volume ==
+    US -> UI: SCL: Alarm Volume Slider
+    UI -> SW: ACT: Request Volume Adjustment \
+                \n\tonReleased: send slider value
+
+    SW -> TD: MSG: [xB: #1]     \
+                \n\tRequest:    \
+                \n\t(U32) volume
+
+    TD -> SW: MSG: [xC: #1]             \
+                \n\tResponse:           \
+                \n\t(BOOL)  accepted    \
+                \n\t(U32)   RR
+
+    alt successful ( exit == 0 )
+        SW -> UI: ACT: Send accepted volume value 
+        UI -> UI: ACT: Update Volume Text and slider position
+    else failed
+        SW -> UI: ACT: Send error message
+        UI -> US: ACT: Notify user
+    end
+@enduml
Index: sources/gui/qml/components/HeaderBar.qml
===================================================================
diff -u -r67557d6769a1719e2a1c068303bda9816075dd84 -r8144efe22a7a15f19e6e958a40b3360096c84c49
--- sources/gui/qml/components/HeaderBar.qml	(.../HeaderBar.qml)	(revision 67557d6769a1719e2a1c068303bda9816075dd84)
+++ sources/gui/qml/components/HeaderBar.qml	(.../HeaderBar.qml)	(revision 8144efe22a7a15f19e6e958a40b3360096c84c49)
@@ -95,11 +95,7 @@
         highlightHeight : 15
         isMainTreatment : true
 
-        onHiddenChanged: {
-            if (hidden) {
-                index = 0
-            }
-        }
+        onHiddenChanged: if (hidden) { index = 0 }
     }
 
     Row { id: _headerButtonRow
@@ -167,3 +163,4 @@
         }
     }
 }
+