Hints for powerdevil in main

Errors

• icon-not-found
  The icon 'brightness-high' was not found in the archive. This issue can have multiple reasons:
  • The icon is not present in the archive.
  • The icon is in a wrong directory.
  • The icon is not available in a suitable size (at least 64x64px)
  • On Debian and Ubuntu, the icon is a symlink. The generator cannot read symlinks on these distributions - make the icon a real file.
  To make the icon easier to find, place it in /usr/share/icons/hicolor/<size>/apps and ensure the Icon= value of the .desktop file is set correctly.