x window system: refined screen blanking

wiki/linux/x_window_system.md

@@ -58,18 +58,31 @@ Additionally to the guides in this section that are independent of the used
 graphics unit special configuration for [Nvidia](/wiki/linux/nvidia.md)
 and [Intel](./intel.md) can be found in their respective entries in this wiki.
 
-##### Screen Blanking
+##### Turning Off the Screen
 
 To save power the screen is set to turn black after a given amount of time.
-This can be disabled temporarily by running `xset s off` or permanently by
-adding the following lines to your `/etc/X11/xorg.conf`:
+Adding the following lines to your `/etc/X11/xorg.conf.d/dpms.conf` will permanently enable screen
+blanking.
+
+```txt
+[Monitor]
+Option "DPMS" "true"
+```
+
+Additionally configure the times of the following section (both `0` at the moment) and add it to the
+`ServerFlags` option of the file `/etc/X11/xorg.conf.d/dpms.conf` or alternatively add them into the
+file `/etc/X11/xorg.conf`.
 
 ```txt
 Section "ServerFlags"
+    Option "OffTime" "0"
     Option "BlankTime" "0"
 EndSection
 ```
 
+This can be disabled temporarily by running `xset s off`.
+The screen can also be turned off instantly with the command `xset dpms force off`.
+
 ##### Adjust DPI and UI Scale
 
 The dots per inch (DPI) is a measurement of spatial video dot density.