Lubuntu 16.04 touchpad problems

Question

I recently upgraded my 900x3a notebook from 14.04 -> 16.04.

Since then the touchpad performance is bad. The pointer will sometimes freeze or execute ungiven commands. When this happens I often see an increase in CPU usage. First I thought its a xserver problem but when I add an USB mouse these problems dont occur (with the mouse, still occur with the touchpad).

I also tried a lubuntu 16.04 live USB stick and was able to reproduce the problem.

The linked solution posted in Mouse pointer (touchpad) getting stuck often in 12.04

(CTRL+ALT+F2) and back (CTRL+ALT+F7) works as a temporary fix if the problem occurs but does not solve this as the problem just will reoccur. Should I report this as a bug?

I changed to ´libinput´ as suggested below and both frequency and severeness of the problem decreased. As requested here is the input of the xinput command:

⎡ Virtual core pointer                      id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ SynPS/2 Synaptics 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)]
    ↳ WebCam SC-13HDL10931N                     id=10   [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=11   [slave  keyboard (3)]

The problem might be connected to the use of scrolling or other multifinger commands but I have not had a sufficient number of incidents to be sure.

Do you have any suggestions how to fix this or what to try next?

Thanks!

score 1 · Accepted Answer · answered Aug 01 '16 at 11:16

I suggest installing libinput. It works better in 16.04, than the old xorg-synaptics.

Install it by

sudo apt install xserver-xorg-input-libinput

Tapping is disabled by default. If you need this feature, you can enable it by adding

Option "Tapping" "True"

to the touchpad section of /usr/share/X11/xorg.conf.d/90-libinput.conf

Lubuntu 16.04 touchpad problems

1 Answers1