The problem is that your touchpad doesn't support multi-finger touch.
You can still try and see if multi-finger emulation (which is not
guaranteed to work) solves the problem by playing with the values
assigned to the following properties:
1) "Synaptics Two-Finger Width" which sets the pressure threshold to emulate a
two finger press.
2) "Synaptics Two-Finger Pressure" which sets the finger width threshold to
emulate a two finger press.
You can set these properties with the following commands:
xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Synaptics Two-Finger Width"
32 7
xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Synaptics Two-Finger
Pressure" 32 280
and experiment with a value other than 7 for the former and with a value
other than 280 for the latter, until you find a combination which works
well with your hardware.
and of course you will also have to enable multi-finger scrolling (as you did
before):
xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Synaptics Two-Finger
Scrolling" 8 1 0
If you find a combination of values which you deem acceptable, please
let me know and also attach the output of the "lshal" command so that I
can add a quirk for your laptop (so that those values are applied by
default to the touchpad of your laptop).
** Changed in: xserver-xorg-input-synaptics (Ubuntu)
Status: New => Triaged
** Changed in: xserver-xorg-input-synaptics (Ubuntu)
Importance: Undecided => Low
--
two-finger scrolling does not work on Acer AO531h
https://bugs.launchpad.net/bugs/422224
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