outputs: Adds hotkey and root menu entries to invoke Device 'amdgpu_bl0' of class 'backlight':

	Current brightness: 86 (34%)
	Max brightness: 255 for setting backlight intensity.

Author: phkaeser

doc/ROADMAP.md

@@ -36,12 +36,12 @@ See the [Detailed Feature List](FEATURES.md) for details.
   * Initial placement algorithm.
 
 * Infrastructure
+  * [done] Backlight controls through `brightnessctl` via hotkeyas and root menu.
   * Fix: Handle `Terminal` flag and launch applications in a suitable terminal.
   * Support keypad (tap to click) and middle click alternatives.
   * Support configurable means (eg. Alt+) to emulate right-click on laptop.
   * Write log to logfile (vs. stderr).
   * Have a naive app to show battery status.
-  * Wire up backlight control to window menu.
 
 * Bug fixes
   * [done] Fixes lost keyboard layout group when switching to VT and back ([#449](https://github.com/phkaeser/wlmaker/issues/449)).

etc/Config.plist

@@ -59,6 +59,8 @@
         // exclude the Shift-modifier well.
         "Ctrl+Shift+Page_Up" = OutputMagnify;
         "Ctrl+Shift+Page_Down" = OutputReduce;
+        "XF86MonBrightnessDown" = (ShellExecute, "brightnessctl set 5%-");
+        "XF86MonBrightnessUp" = (ShellExecute, "brightnessctl set +5%");
 
         // TODO(kaeser@gubbe.ch): xkbcommon emits XF86Switch_VT_n for Fn only with
         // Ctrl+Alt presset. Means: Here, it should not need the modifiers to be

etc/RootMenu.plist

@@ -11,7 +11,9 @@
   ("Magnify", OutputMagnify),
   ("Reduce", OutputReduce),
   ("Configure", Execute, "wdisplays"),
-  ("Save State", OutputSaveState)),
+  ("Save State", OutputSaveState),
+  ("Reduce brightness", ShellExecute, "brightnessctl set 5%-"),
+  ("Increase brightness", ShellExecute, "brightnessctl set +5%")),
  ("Workspaces...",
   ("New", WorkspaceAdd),
   ("Destroy Last", WorkspaceDestroyLast),