Set mouse pointer resolution a.k.a sensitivity interactively?

[Peter Hutterer]

On Tue, Jan 06, 2015 at 01:03:15AM +0300, Hi-Angel wrote:
> On Mon, Jan 05, 2015 at 08:43:41PM +0100, Simon Thum wrote:
> > You can use xinput properties, those can also be set via inputclass sections
> > if I'm not mistaken.
> >
> > man xinput should get you to it, if not install xinput. Two optionas can be
> > used to achive what you describe:
> >
> > Coordinate Transformation Matrix (140): 1.000000, 0.000000, 0.000000,
> > 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
> Simon Thum, man, I love you, thank you very much! You solved the
> problem! From reading a docs I didn't understood wholly the matrix,
> though. Suppose I set the values of the diagonal that accords to x and
> y to 2. Then we'd have:
> 
> ⎡ 2 0 0 ⎤   ⎡ 1 ⎤   ⎡  2  ⎤
> ⎜ 0 2 0 ⎥ · ⎜ 1 ⎥ = ⎜  2  ⎥
> ⎣ 0 0 1 ⎦   ⎣ 1 ⎦   ⎣  1  ⎦
> 
> The cursor couldn't appear now in the first pixels of the screen! I am
> not sure that this is true…
> Anyway, to sum up the steps to increase the resolution (or, at least,
> the pointer speed):
> 
> $ xinput list #to list a devices
> ⎡ Virtual core pointer                          id=2    [master
> pointer  (3)]
> ⎜   ↳ Virtual core XTEST pointer                id=4    [slave
> pointer  (2)]
> ⎜   ↳ PixArt USB Optical Mouse                  id=10   [slave
> pointer  (2)]
> ⎜   ↳ ETPS/2 Elantech Touchpad                  id=15   [slave
> pointer  (2)]
> ⎣ Virtual core keyboard                         id=3    [master
> keyboard (2)]
>     ↳ Virtual core XTEST keyboard               id=5    [slave
> keyboard (3)]
>     ↳ Power Button                              id=6    [slave  keyboard (3)]
> …
> 
> We see the mouse id is 10, next look at the list of properties:
> 
> $ xinput list-props 100
> Device 'PixArt USB Optical Mouse':
>         Device Enabled (140):   1
>         Coordinate Transformation Matrix (142): 1.000000, 0.000000,
> 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
>         Device Accel Profile (265):     0
>         Device Accel Constant Deceleration (266):       1.000000
>         Device Accel Adaptive Deceleration (267):       1.000000
>         Device Accel Velocity Scaling (268):    10.000000
>         Device Product ID (260):        2362, 9488
>         Device Node (261):      "/dev/input/event5"
>         Evdev Axis Inversion (269):     0, 0
>         Evdev Axes Swap (271):  0
> …
> 
> Next set the first two «ones» of the property №142 to any other value
> and see does the pointer speed now good for us:
> 
> $
> xinput set-prop 10 142 2.400000, 0.000000, 0.000000, 0.000000,
> 2.400000, 0.000000, 0.000000, 0.000000, 1.000000
> 
> That's all!

if you want to make this more general, use the device name and the property
name.

xinput set-prop "PixArt USB Optical Mouse" "Coordinate Transformation
Matrix" ....

that way you're not affected when the device id/property number changes.

Cheers,
   Peter