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My System: OS: Linux Mint 18 Sarah KDE Plasma 5 laptop: Acer Aspire V112p

this is the output of the command xinput

    xinput
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ ELAN Touchscreen                          id=10   [slave  pointer  (2)]
⎜   ↳ SYN1B7D:01 06CB:2991 Touchpad             id=12   [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)]                                                                                           
    ↳ Video Bus                                 id=7    [slave  keyboard (3)]                                                                                           
    ↳ Power Button                              id=8    [slave  keyboard (3)]                                                                                           
    ↳ Sleep Button                              id=9    [slave  keyboard (3)]                                                                                           
    ↳ HD WebCam                                 id=11   [slave  keyboard (3)]                                                                                           
    ↳ AT Translated Set 2 keyboard              id=13   [slave  keyboard (3)]                                                                                           
    ↳ Acer WMI hotkeys 

basically the cursor would sometimes all of a sudden just move erractially across the screen. I have no idea what's causing this problem.

I've checked using xinput test, and i'm now very positive that the touchpad(id=12) is the one that's causing the problem.

  • Does your touchpad have any damage like dents or scratches? Is there any dust or other material wedged under the edges of the touchpad? Does the mouse cursor always move in the same general direction by itself? – Criggie Dec 7 '16 at 9:40
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Go to System Settings -> Input Devices -> Touchpad -> Enable/Disable

There are various options there that you can configure to help you resolve the issue. I guess you need to disable the touchpad while typing and/or while an external mouse is connected.

  • tried "disable touchpad while typing" , still won't work. I don't have an external mouse – applepie Dec 7 '16 at 0:27
  • I'm just guessing, can this problem be solved if I install synaptics ? (or libinput ) – applepie Dec 7 '16 at 0:29
  • Hmmm..... In my case I never needed to use anything else like synaptics. You could give it a try though :\ – jsalatas Dec 7 '16 at 0:31
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https://wiki.archlinux.org/index.php/Touchpad_Synaptics describes many options you can experiment with to make the touchpad less sensitive, and to debug problems. (It's not Arch specific.) Fiddling with synclient has sometimes helped me.

0

Unless there is no paranormal activity at your work place and no hardware issues, this shouldn't happen :)

There are many possible ways you can check/debug this issue.

  • First of all make sure whether it happens only for touch pad or even for mouse events.
  • Reset your touch pad settings to default settings.
  • Analyze what kind of events you are getting when it moves randomly using evtest /dev/input/event* (Since you have touchscreen events might comes thorugh touch also)
  • Reinstall the driver for your touchpad.
  • Last but not the least take it to the repair shop :)

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