Bug#754965:
Not sure if 'me too' reports are welcome, but... I too am hit by this
problem, on different touchpad hardware. Downgrading the xserver
packages back to the previous versions in Jessie (1.15.99 --> 1.15.1)
restored touchpad functionality. That process downgraded all xserver
packages, including xserver-xorg-input-synaptics from 1.8.0 --> 1.7.3.
The only differences apparent in Xorg.0.log between working and
non-working appear to be various version numbers, and event numbers
in /sys/devices paths...
[ 8.522] (II) config/udev: Adding input device ETPS/2 Elantech Touchpad (/dev/input/event6)
[ 8.522] (**) ETPS/2 Elantech Touchpad: Applying InputClass "evdev touchpad catchall"
[ 8.522] (**) ETPS/2 Elantech Touchpad: Applying InputClass "touchpad catchall"
[ 8.522] (**) ETPS/2 Elantech Touchpad: Applying InputClass "Default clickpad buttons"
[ 8.522] (II) LoadModule: "synaptics"
[ 8.522] (II) Loading /usr/lib/xorg/modules/input/synaptics_drv.so
[ 8.523] (II) Module synaptics: vendor="X.Org Foundation"
[ 8.523] compiled for 1.15.99.904, module version = 1.8.0
[ 8.523] Module class: X.Org XInput Driver
[ 8.523] ABI class: X.Org XInput driver, version 21.0
[ 8.523] (II) Using input driver 'synaptics' for 'ETPS/2 Elantech Touchpad'
[ 8.523] (**) ETPS/2 Elantech Touchpad: always reports core events
[ 8.523] (**) Option "Device" "/dev/input/event6"
[ 8.636] (--) synaptics: ETPS/2 Elantech Touchpad: x-axis range 0 - 2940 (res 0)
[ 8.636] (--) synaptics: ETPS/2 Elantech Touchpad: y-axis range 0 - 1400 (res 0)
[ 8.636] (--) synaptics: ETPS/2 Elantech Touchpad: pressure range 0 - 255
[ 8.636] (--) synaptics: ETPS/2 Elantech Touchpad: finger width range 0 - 15
[ 8.636] (--) synaptics: ETPS/2 Elantech Touchpad: buttons: left right double triple
[ 8.636] (--) synaptics: ETPS/2 Elantech Touchpad: Vendor 0x2 Product 0xe
[ 8.636] (--) synaptics: ETPS/2 Elantech Touchpad: touchpad found
[ 8.636] (**) ETPS/2 Elantech Touchpad: always reports core events
[ 8.716] (**) Option "config_info" "udev:/sys/devices/platform/i8042/serio1/input/input6/event6"
[ 8.716] (II) XINPUT: Adding extended input device "ETPS/2 Elantech Touchpad" (type: TOUCHPAD, id 11)
[ 8.716] (**) synaptics: ETPS/2 Elantech Touchpad: (accel) MinSpeed is now constant deceleration 2.5
[ 8.716] (**) synaptics: ETPS/2 Elantech Touchpad: (accel) MaxSpeed is now 1.75
[ 8.716] (**) synaptics: ETPS/2 Elantech Touchpad: (accel) AccelFactor is now 0.061
[ 8.717] (**) ETPS/2 Elantech Touchpad: (accel) keeping acceleration scheme 1
[ 8.717] (**) ETPS/2 Elantech Touchpad: (accel) acceleration profile 1
[ 8.717] (**) ETPS/2 Elantech Touchpad: (accel) acceleration factor: 2.000
[ 8.717] (**) ETPS/2 Elantech Touchpad: (accel) acceleration threshold: 4
[ 8.717] (--) synaptics: ETPS/2 Elantech Touchpad: touchpad found
[ 8.718] (II) config/udev: Adding input device ETPS/2 Elantech Touchpad (/dev/input/mouse0)
[ 8.718] (**) ETPS/2 Elantech Touchpad: Ignoring device from InputClass "touchpad ignore duplicates"
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