x: removed typo

wiki/linux/arch-linux/installation.md

@@ -202,8 +202,9 @@ UEFI, don't forget to enable the EFI option, otherwise the system won't boot.
 
 Now you can follow the recommended larbs installation script of this wiki
 (`curl -o larbs.sh https://raw.githubusercontent.com/tiyn/larbs/master/larbs.sh`)
-this will install a bunch of useful base software including a graphical
-environment.
+this will install a bunch of useful base software including
+[a graphical environment](../x_window_system.md) and
+[a window manager](../suckless.md#programs).
 You can go on to other guides aswell.
 
 Additionally if you have a NVidia Graphics Cards you should read

wiki/linux/nvidia.md

@@ -17,7 +17,9 @@ There is no initial setup in for of a `xorg.conf` in `/etc/X11` needed
 
 After running `sudo nvidia-setting` can drag and drop the monitors to your
 liking.
-After that you have to save the configuration to the `/etc/X11/xorg.conf`.
+After that you have to save the configuration to the
+[X window manager](./x_window_system.md) configuration file
+`/etc/X11/xorg.conf`.
 
 ## Avoid screen tearing
 

wiki/linux/x11.md

@@ -1,37 +0,0 @@
-# X11
-
-## Change Keyboardlayout
-
-To temporarily change the layout of the keyboard just run
-`setxkbmap <your preferred layout>`.
-For a permanent change run `localectl set-x11-keymap <your preferred layout>`.
-
-## Screen Tearing
-
-### Intel Graphics
-
-Linux can sometimes have problems with screen tearing.
-To get this working you need to change the `/etc/X11/xorg.conf.d/20-intel.conf` to:
-
-```txt
-Section "Device"
-    Identifier "Intel Graphics"
-    Driver "intel"
-    Option "TearFree" "true"
-EndSection
-```
-
-This was found on
-[maketecheasier](https://www.maketecheasier.com/get-rid-screen-tearing-linux).
-
-## Disable Screen Blanking
-
-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`:
-
-```txt
-Section "ServerFlags"
-    Option "BlankTime" "0"
-EndSection
-```

wiki/linux/x_window_system.md

@@ -0,0 +1,92 @@
+# X Window System
+
+X Window System - also called X and X11 according to the current version - is a
+protocoll for handling the display of the most unix-like operating systems.
+[Xorg](https://www.x.org/wiki/) is the most used implementation of the X
+protocoll.
+It is maintained by the [X.Org Foundation](https://x.org/wiki/).
+
+## Peripheral Devices
+
+X also handles various options of peripheral devices.
+In the files of the directory `/etc/X11/xorg.conf.d` and the file
+`/etc/X11/xorg.conf` these settings can be found.
+
+The handling of input devices is achieved by xinput.
+For this the identifier of the device to show the options of is needed.
+By running `xinput list` a list of all devices with identifiers handled by
+xinput is printed.
+Properties and options of a peripheral device can then be shown by running
+`xinput list-props <id>` where `<id>` is the identifier of the
+device.
+
+
+### Keyboard
+
+#### Change Keyboardlayout
+
+To temporarily change the layout of the keyboard just run
+`setxkbmap <your preferred layout>`.
+For a permanent change run `localectl set-x11-keymap <your preferred layout>`.
+
+### Display
+
+#### Screen Tearing
+
+Linux systems that use intel graphics can sometimes have problems with screen
+tearing.
+To get this working you need to change the `/etc/X11/xorg.conf.d/20-intel.conf`
+as explained on
+[maketecheasier](https://www.maketecheasier.com/get-rid-screen-tearing-linux)
+to:
+
+```txt
+Section "Device"
+    Identifier "Intel Graphics"
+    Driver "intel"
+    Option "TearFree" "true"
+EndSection
+```
+
+#### Disable Screen Blanking
+
+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`:
+
+```txt
+Section "ServerFlags"
+    Option "BlankTime" "0"
+EndSection
+```
+
+### Mouse
+
+#### Enable/Disable the Usage of the Middle Mouse Button
+
+The middle mouse button can be activated or deactivated.
+First the current options have to be confirmed as explained in
+[the peripheral section](#peripheral-devices).
+Important is the property named `libinput Middle Emulation Enabled`.
+To enable the usage of the middle mouse button it should be set to `1`.
+As written by
+[opinion_no9](https://askubuntu.com/questions/160164/how-do-i-enable-middle-mouse-button-emulation-in-12-04-lts/902976#902976)
+there are two ways to change this property.
+If the change is only needed temporarily
+`xinput set-prop <id> "libinput Middle Emulation Enabled" <flag>` can be run.
+`<id>` is the identifier of the mouse and <flag> is `0` for disabling and `1`
+for enabling the middle mouse button.
+For permanent change of the property a change or addition to
+`/etc/X11/xorg.conf.d/40-libinput.conf` can be made.
+If a section for the device is already present the line
+`Option "MiddleEmulation" "true"` should be added to it.
+Otherwise a catchall section for all types of mouses can be created like the
+following:
+
+```txt
+Section "InputClass"
+    Identifier "middle button emulation class"
+    MatchIsPointer "on"
+    Option "MiddleEmulation" "true"
+EndSection
+```