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#1 2017-11-17 16:39:50

symon
Member
Registered: 2014-06-25
Posts: 16

Touchpad on Thinkpad X240 "moving in squares"

Hi everyone,
I really struggle on how to describe my problem in english. I recently bought a Thinkpad X240. It has a touchpad:

xinput list
⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
⎜   ↳ xwayland-pointer:13                     	id=6	[slave  pointer  (2)]
⎜   ↳ xwayland-relative-pointer:13            	id=7	[slave  pointer  (2)]
⎣ Virtual core keyboard                   	id=3	[master keyboard (2)]
    ↳ Virtual core XTEST keyboard             	id=5	[slave  keyboard (3)]
    ↳ xwayland-keyboard:13                    	id=8	[slave  keyboard (3)]
Device:           SynPS/2 Synaptics TouchPad
Kernel:           /dev/input/event18
Group:            8
Seat:             seat0, default
Size:             109x96mm
Capabilities:     pointer gesture
Tap-to-click:     disabled
Tap-and-drag:     enabled
Tap drag lock:    disabled
Left-handed:      disabled
Nat.scrolling:    disabled
Middle emulation: disabled
Calibration:      n/a
Scroll methods:   *two-finger edge 
Click methods:    *button-areas clickfinger 
Disable-w-typing: enabled
Accel profiles:   none
Rotation:         n/a

Device:           TPPS/2 IBM TrackPoint
Kernel:           /dev/input/event19
Group:            9
Seat:             seat0, default
Capabilities:     pointer 
Tap-to-click:     n/a
Tap-and-drag:     n/a
Tap drag lock:    n/a
Left-handed:      disabled
Nat.scrolling:    disabled
Middle emulation: disabled
Calibration:      n/a
Scroll methods:   *button
Click methods:    none
Disable-w-typing: n/a
Accel profiles:   flat *adaptive
Rotation:         n/a

Device:           ThinkPad Extra Buttons
Kernel:           /dev/input/event5
Group:            10
Seat:             seat0, default
Capabilities:     keyboard 
Tap-to-click:     n/a
Tap-and-drag:     n/a
Tap drag lock:    n/a
Left-handed:      n/a
Nat.scrolling:    n/a
Middle emulation: n/a
Calibration:      n/a
Scroll methods:   none
Click methods:    none
Disable-w-typing: n/a
Accel profiles:   n/a
Rotation:         n/a

So I configured everything using the gnome settings application. Touch to click as well as two-finger-scrolling work very well.
But: When I mov ethe mouse very slowly in a diagonal way it becomes visible that it is not moving smoothly. It really looks much more as if it would be moving in little angles. Like so: ┘ instead of /. If you think of it in a graphical way.

I hope this is understandable. At least a little. Since I have no real idea on how to describe this in english properly I have no idea on how to google for a solution or at least I did not find something on that matter.
Any idea on how to solve that issue? I think it really is a problem with the touchpad because if I use the trackpoint everything works.

Thank You

Last edited by symon (2017-11-17 17:00:31)

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#2 2017-12-26 10:02:48

symon
Member
Registered: 2014-06-25
Posts: 16

Re: Touchpad on Thinkpad X240 "moving in squares"

Just in case somebody has the same issues: The problem is the resolution of the touchpad.
These lines in the according xorg config file solved the problem:

Option "VertResolution" "1000"
Option "HorizResolution" "650"

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