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====== Ubuntu - Mouse - Change Mouse Sensitivity ======

  * [[Ubuntu:Mouse:Determine the Mouse|Determine the Mouse]].

----

===== Determine the system =====

<code bash>
xinput list-props 8
</code>

returns:

<code bash>
Device 'Razer Razer DeathAdder V2':
	Device Enabled (155):	1
	Coordinate Transformation Matrix (157):	1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
	libinput Natural Scrolling Enabled (291):	0
	libinput Natural Scrolling Enabled Default (292):	0
	libinput Scroll Methods Available (293):	0, 0, 1
	libinput Scroll Method Enabled (294):	0, 0, 0
	libinput Scroll Method Enabled Default (295):	0, 0, 0
	libinput Button Scrolling Button (296):	2
	libinput Button Scrolling Button Default (297):	2
	libinput Middle Emulation Enabled (298):	0
	libinput Middle Emulation Enabled Default (299):	0
	libinput Accel Speed (300):	0.742647
	libinput Accel Speed Default (301):	0.000000
	libinput Accel Profiles Available (302):	1, 1
	libinput Accel Profile Enabled (303):	1, 0
	libinput Accel Profile Enabled Default (304):	1, 0
	libinput Left Handed Enabled (305):	0
	libinput Left Handed Enabled Default (306):	0
	libinput Send Events Modes Available (276):	1, 0
	libinput Send Events Mode Enabled (277):	0, 0
	libinput Send Events Mode Enabled Default (278):	0, 0
	Device Node (279):	"/dev/input/event7"
	Device Product ID (280):	5426, 132
	libinput Drag Lock Buttons (307):	<no items>
	libinput Horizontal Scroll Enabled (308):	1
</code>

<WRAP info>
**NOTE:**  The initial 8 is the Mouse Id as determined per [[Ubuntu:Mouse:Determine the Mouse|Determine the Mouse]].

  * The **libinput** lines indicate that this is **Wayland/libinput**.

</WRAP>

----

===== On Wayland/libinput systems =====

<code bash>
xinput --set-prop "Device Name" "libinput Accel Speed" -0.9
</code>

<WRAP info>
**NOTE:**  The number must be an integer between 1 and -1, and appears less flexible than the old **Constant Deceleration** setting.

  * Check [[https://wayland.freedesktop.org/libinput/doc/latest/pointer-acceleration.html#ptraccel-linear|this plot]] to see the impact of different acceleration speed values. 

  * libinput calculates the mouse acceleration depending on the DPI and the parameter Acceleration Speed.

</WRAP>

----

===== On non-Wayland/libinput systems =====

<code bash>
xinput --set-prop "Device Name" "Device Accel Constant Deceleration" 5
</code>

<WRAP info>
**NOTE:**  The lower the number the faster it will be, similarly, higher the number slower it will be.
</WRAP>

----

==== To turn off mouse acceleration ====

<code bash>
xinput --set-prop "Razer DeathAdder" "Device Accel Velocity Scaling" 1
xinput --set-prop "Razer DeathAdder" "Device Accel Profile" -1
</code>


----

===== Confirm any changes =====

<code bash>
xinput --list-props 8
</code>

<WRAP info>
**NOTE:** The 8 is the device-id per [[Ubuntu:Mouse:Determine the Mouse|Determine the Mouse]].
</WRAP>

----

===== Using xset to change acceleration =====

xset can also be used to change acceleration.

<WRAP info>
**NOTE:** xset does not use libinput.
</WRAP>

----

==== Get the current xset values ====

<code bash>
xset q | grep -A 1 Pointer
</code>

returns:

<code bash>
Pointer Control:
  acceleration:  2/1    threshold:  4
</code>

<WRAP info>
**NOTE:**

  * **acceleration** defines how many times faster the cursor will move than the default speed.
    * acceleration can be a fraction.
    * To slow down the mouse, use 1/2, 1/3, 1/4, ...
    * To make it faster, use 2/1, 3/1, 4/1, ...

  * **threshold** is the velocity required for acceleration to become effective, usually measured in device units per 10ms.
    * Threshold defines the point at which acceleration should occur in pixels per 10 ms.
    * If threshold is zero, then acceleration is treated as "the exponent of a more natural and continuous formula.".
      * This gives precise control for slow motion but big reach for fast motion, and a progressive transition for motions in between.

</WRAP>

----

==== Set new values ====

<code bash>
xset m acceleration threshold
</code>

<WRAP info>
**NOTE:**

  * **acceleration** defines how many times faster the cursor will move than the default speed.
    * acceleration can be a fraction.
    * To slow down the mouse, use 1/2, 1/3, 1/4, ...
    * To make it faster, use 2/1, 3/1, 4/1, ...

  * **threshold** is the velocity required for acceleration to become effective, usually measured in device units per 10ms.
    * Threshold defines the point at which acceleration should occur in pixels per 10 ms.
    * If threshold is zero, then acceleration is treated as "the exponent of a more natural and continuous formula.".
      * This gives precise control for slow motion but big reach for fast motion, and a progressive transition for motions in between.
      * Recommended acceleration value in this case is 3/2 to 2, but not limited to that range. <code bash>
xset m 3/2 0
</code>

</WRAP>


To reduce mouse acceleration

<code bash>
xset mouse 1 1
</code>

To increase the mouse speed
<code bash>
xset mouse 10 1
</code>

----

==== Reset xset to the default settings ====

<code bash>
xset m default
</code>

----

===== Save the New Setting Permanently =====

Add a new file in **/usr/share/X11/xorg.conf.d/**.

For example, /usr/share/X11/xorg.conf.d/60-razer-deathadder-v2.conf

<file bash /usr/share/X11/xorg.conf.d/60-razer-deathadder-v2.conf>
Section "InputClass"
   Identifier      "Razer Deathadder v2"
   MatchProduct    "Razer Razer DeathAdder V2"
   Option          "ConstantDeceleration" "3"
   Option          "ButtonMapping" "1 0 3 4 5 6 7 8 9"
EndSection
</file>

<WRAP info>
**NOTE:** 

  * The filename can be anything similar.

  * **Identifier**:  Can be anything.
  * **MatchProduct**:  Product name from xinput list.
  * **Option**:  The options to change.

</WRAP>


----

===== References =====

https://wayland.freedesktop.org/libinput/doc/latest/pointer-acceleration.html#ptraccel-linear

https://wiki.archlinux.org/title/Mouse_acceleration

https://newbedev.com/decrease-mouse-sensitivity-below-the-standard-limit