Comment 2 for bug 803610

Just seem to have resolved the issue by also installing gsynaptics (removed a few days earlier), now I am back to a fuctional touchpad in gnome. So it may be more a gnome issue (although unity showed same problem, freeze after login).

So this bug should be closed, I will see if problem reappears.

One more comment: installing xserver-xorg-input-synaptics immediately crashed the xserver, that may be the segfault seen in the log file (XorgLogOld.txt ...).

---Other tests below---

After uninstalling xserver-xorg-input-synaptics the Xserver log looks like this:

[ 19776.245] (II) config/udev: Adding input device SynPS/2 Synaptics TouchPad (/dev/input/event6)
[ 19776.245] (**) SynPS/2 Synaptics TouchPad: Applying InputClass "evdev touchpad catchall"
[ 19776.245] (II) Using input driver 'evdev' for 'SynPS/2 Synaptics TouchPad'
[ 19776.245] (II) Loading /usr/lib/xorg/modules/input/evdev_drv.so
[ 19776.245] (**) SynPS/2 Synaptics TouchPad: always reports core events
[ 19776.245] (**) SynPS/2 Synaptics TouchPad: Device: "/dev/input/event6"
[ 19776.245] (--) SynPS/2 Synaptics TouchPad: Found 3 mouse buttons
[ 19776.246] (--) SynPS/2 Synaptics TouchPad: Found absolute axes
[ 19776.247] (--) SynPS/2 Synaptics TouchPad: Found x and y absolute axes
[ 19776.247] (--) SynPS/2 Synaptics TouchPad: Found absolute touchpad.
[ 19776.247] (II) SynPS/2 Synaptics TouchPad: Configuring as touchpad
[ 19776.248] (**) SynPS/2 Synaptics TouchPad: YAxisMapping: buttons 4 and 5
[ 19776.248] (**) SynPS/2 Synaptics TouchPad: EmulateWheelButton: 4, EmulateWheelInertia: 10, EmulateWheelTimeout: 200
[ 19776.248] (**) Option "config_info" "udev:/sys/devices/platform/i8042/serio1/input/input6/event6"
[ 19776.248] (II) XINPUT: Adding extended input device "SynPS/2 Synaptics TouchPad" (type: TOUCHPAD)
[ 19776.248] (II) SynPS/2 Synaptics TouchPad: initialized for absolute axes.
[ 19776.248] (**) SynPS/2 Synaptics TouchPad: (accel) keeping acceleration scheme 1
[ 19776.248] (**) SynPS/2 Synaptics TouchPad: (accel) acceleration profile 0
[ 19776.248] (**) SynPS/2 Synaptics TouchPad: (accel) acceleration factor: 2.000
[ 19776.248] (**) SynPS/2 Synaptics TouchPad: (accel) acceleration threshold: 4
[ 19776.249] (II) config/udev: Adding input device SynPS/2 Synaptics TouchPad (/dev/input/mouse0)
[ 19776.249] (II) No input driver/identifier specified (ignoring)

[...snip...]

[ 20274.968] (EE) SynPS/2 Synaptics TouchPad: Tried to post event for non-existent touch 0
[...repeated 50x...]

There are similar bug descriptions around:
#760669 i have no syndaemeon installed, so cannot test solution (don't start syndaemon twice)