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x11: peripheral devices

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# X11
## Change Keyboardlayout
X, X Window System 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>`.
## Screen Tearing
### Display
### Intel Graphics
#### Screen Tearing
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:
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"
@ -21,10 +48,7 @@ Section "Device"
EndSection
```
This was found on
[maketecheasier](https://www.maketecheasier.com/get-rid-screen-tearing-linux).
## Disable Screen Blanking
#### 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
@ -35,3 +59,34 @@ 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
```