T480s Trackpoint drifts

[Peter Hutterer]

On Thu, Mar 22, 2018 at 11:36:55AM +0800, Kai Hendry wrote:
> Well I never installed gnome/kde to begin with.
> 
> On Thu, 22 Mar 2018, at 11:24 AM, Peter Hutterer wrote:
> > don't get me wrong but - if you're capable of removing gnome/kde for
> > whatever reasons, you're capable of figuring out xinput. there are plenty of
> > guides on google, some of which are even accurate.
> 
> The thing that puzzles me here is:
> 
> [hendry at t480s ~]$ xinput --list-props 11
> Device 'ETPS/2 Elantech TrackPoint':
>         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
>         libinput Natural Scrolling Enabled (275):       0
>         libinput Natural Scrolling Enabled Default (276):       0
>         libinput Left Handed Enabled (277):     0
>         libinput Left Handed Enabled Default (278):     0
>         libinput Accel Speed (279):     0.000000
>         libinput Accel Speed Default (280):     0.000000
>         libinput Accel Profiles Available (281):        1, 1
>         libinput Accel Profile Enabled (282):   1, 0
>         libinput Accel Profile Enabled Default (283):   1, 0
>         libinput Scroll Methods Available (284):        0, 0, 1
>         libinput Scroll Method Enabled (285):   0, 0, 1
>         libinput Scroll Method Enabled Default (286):   0, 0, 1
>         libinput Button Scrolling Button (287): 2
>         libinput Button Scrolling Button Default (288): 2
>         libinput Middle Emulation Enabled (289):        0
>         libinput Middle Emulation Enabled Default (290):        0
>         libinput Send Events Modes Available (260):     1, 0
>         libinput Send Events Mode Enabled (261):        0, 0
>         libinput Send Events Mode Enabled Default (262):        0, 0
>         Device Node (263):      "/dev/input/event7"
>         Device Product ID (264):        2, 14
>         libinput Drag Lock Buttons (291):       <no items>
>         libinput Horizontal Scroll Enabled (292):       1
> [hendry at t480s ~]$ uname -a
> Linux t480s 4.15.9-1-ARCH #1 SMP PREEMPT Sun Mar 11 17:54:33 UTC 2018 x86_64 GNU/Linux
> 
> For example IIUC the  Accel Speed is already zero. So what on earth do I change it to?

see the libinput documentation, it's a normalised value from -1.0 (slowest) to
1.0 (fastest) with 0 being the usually-default midpoint.

Cheers,
   Peter