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I have encountered a strange problem after upgrading my kernel in ubuntu 14.04, mainly the touchpad scrolling stopped working. After spending some time on debuging I came to a conclusion that synaptics driver is not loaded. This are the clues that make me think so:

1) touchpad is detected

$ xinput -l
...
⎜   ↳ PS/2 Synaptics TouchPad                   id=12   [slave  pointer  (2)]`

2) no trace of 'synaptics' driver in Xorg.0.log:

$ cat /var/log/Xorg.0.log | grep synaptics

is empty

3) finally in the same log file I found line which states:

[    34.046] (II) Using input driver 'evdev' for 'PS/2 Synaptics TouchPad'

which is quite straightforward. I have tried purging and reinstalling xserver-xorg-input-synaptics with no good effect. Also config file /usr/share/X11/xorg.conf.d/50-synaptics.conf look OK to me as it contains:

Section "InputClass"
    Identifier "touchpad catchall"
    Driver "synaptics"
    MatchIsTouchpad "on"
# This option is recommend on all Linux systems using evdev, but cannot be 
# enabled by default. See the following link for details:
# http://who-t.blogspot.com/2010/11/how-to-ignore-configuration-errors.html
  MatchDevicePath "/dev/input/event*" 
EndSection

what may be a little strange is that my system possesses copy of this file located in /etc/X11/xorg.conf.d

of course I am not able to change anything from graphical mode (Settings->Mouse and Touchpad) as there are no options there.

Does anyone have an idea why does my system ignore config file 50-synaptics.conf and uses evdev as driver?

EDIT: kernel I use now is 3.13.0-43-generic. last time the touchpad worked correctly was with 3.13.0-29-generic

Picek
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  • Same issue (unresolved) as: http://askubuntu.com/questions/455516/touchpad-not-recognized-on-new-ultrabook – david6 Jan 02 '15 at 20:58
  • Possible root cause / solution: http://askubuntu.com/questions/548725/touchpad-not-working-in-ubuntu-14-04 – david6 Jan 02 '15 at 20:59
  • if I understood correctly both of those problems affect kernels 3.15-RC. my system uses 3.13.0-43-generic kernels from Ubuntu repositories. – Picek Jan 04 '15 at 15:08
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    More correctly: there is an up-stream fix, that may not arrive until 3.16 is released. You may need to try a newer/beta kernel. – david6 Jan 04 '15 at 21:19

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