Comment 48 for bug 1382291

The background won't be changed after commented "Gdk/WindowScalingFactor" in plugins/xsettings/gsd-xsettings-manager.c of unity-settings-daemon:

 557 static void
 558 xft_settings_set_xsettings (GnomeXSettingsManager *manager,
 559 GnomeXftSettings *settings)
... ...
 568 xsettings_manager_set_string (manager->priv->managers [i], "Xft/HintStyle", settings->hintstyle);
 569 // xsettings_manager_set_int (manager->priv->managers [i], "Gdk/WindowScalingFactor", settings->window_scale);
 570 xsettings_manager_set_int (manager->priv->managers [i], "Gdk/UnscaledDPI", settings->dpi);
 571 xsettings_manager_set_int (manager->priv->managers [i], "Xft/DPI", settings->scaled_dpi);
... ...
 574 }
 575 gnome_settings_profile_end (NULL);
 576 }