The change can be made permanent by creating a file
/etc/X11/xorg.conf.d/11-synaptics.conf with the following:
Section "InputClass"
Identifier "touchpad twofinger"
MatchProduct "SynPS/2 Synaptics TouchPad"
MatchIsTouchpad "on"
Driver "synaptics"
Option "SHMConfig" "true"
Option "HorizEdgeScroll" "on"
Option "VertEdgeScroll" "on"
Option "VertTwoFingerScroll" "on"
Option "EmulateTwoFingerMinZ" "4"
Option "HorizTwoFingerScroll" "on"
Option "CornerCoasting" "on"
Option "PalmDetect" "on"
Option "CircularScrolling" "on"
Option "CircScrollTrigger" "3"
EndSection
I needed to copy the file from /usr/lib/X11/xorg.conf.d/05-evdev.conf
into the same directory to prevent the keyboard from not being
configured. Not sure why this was necessary.
This was based on discussion in
http://ubuntuforums.org/showthread.php?t=1467189.
I think the udev configuration didn't find its way into the new
xorg.conf.d based configuration. The gnome setting for two-finger
scroll is greyed out, but the two finger scroll works.
Not sure if the SHMConfig does anything since I read elsewhere that it
no longer works with Xorg 1.8.
--
two finger scroll/multitouch trackpad not working on lenovo thinkpad w510
https://bugs.launchpad.net/bugs/554980
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