Synaptics Touchpad not detected

Linux blockhead 2.6.17-10-generic #2 SMP Tue Dec 5 22:28:26 UTC 2006 i686 GNU/Linux

Lenovo 3000 C100

Xubuntu 7.4

the touchpad stopped working after upgrade from 6.10

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There is no Synaptics Touchpad in the input device list
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$ cat /proc/bus/input/devices
I: Bus=0011 Vendor=0001 Product=0001 Version=ab41
N: Name="AT Translated Set 2 keyboard"
P: Phys=isa0060/serio0/input0
S: Sysfs=/class/input/input0
H: Handlers=kbd event0
B: EV=120013
B: KEY=4004 2002000 3802078 f840d001 f2ffffdf ffefffff ffffffff ffffffff
B: MSC=10
B: LED=7

I: Bus=0003 Vendor=062a Product=0000 Version=0000
N: Name="HID 062a:0000"
P: Phys=usb-0000:00:1d.1-2/input0
S: Sysfs=/class/input/input7
H: Handlers=mouse0 event1 ts0
B: EV=7
B: KEY=70000 0 0 0 0 0 0 0 0
B: REL=103

-----------------------------------
relevant sections of Xorg.conf
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Section "Module"
        Load "i2c"
        Load "bitmap"
        Load "ddc"
        Load "dri"
        Load "extmod"
        Load "freetype"
        Load "glx"
        Load "int10"
        Load "type1"
        Load "vbe"
        Load "synaptics"
EndSection

Section "InputDevice"
        Identifier "Synaptics Touchpad"
        Driver "synaptics"
        Option "SendCoreEvents" "true"
        Option "Device" "/dev/psaux"
        Option "Protocol" "auto-dev"
        Option "HorizScrollDelta" "0"
        Option "SHMConfig" "on"
EndSection

Section "ServerLayout"
        Identifier "Default Layout"
        Screen "Default Screen"
        InputDevice "Generic Keyboard"
        InputDevice "Configured Mouse"
        InputDevice "Synaptics Touchpad"
        #InputDevice "stylus" "SendCoreEvents"
        #InputDevice "cursor" "SendCoreEvents"
        #InputDevice "eraser" "SendCoreEvents"
EndSection

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and Xorg.0.log
-------------------

$ cat /var/log/Xorg.0.log | grep ynaptics
(**) |-->Input Device "Synaptics Touchpad"
(II) LoadModule: "synaptics"
(II) Loading /usr/lib/xorg/modules/input//synaptics_drv.so
(II) Module synaptics: vendor="The XFree86 Project"
(II) LoadModule: "synaptics"
(II) Reloading /usr/lib/xorg/modules/input//synaptics_drv.so
(II) Synaptics touchpad driver version 0.14.6 (1406)
Synaptics Touchpad no synaptics event device found (checked 12 nodes)
Query no Synaptics: 6003C8
(EE) Synaptics Touchpad no synaptics touchpad detected and no repeater device
(EE) Synaptics Touchpad Unable to query/initialize Synaptics hardware.
(EE) PreInit failed for input device "Synaptics Touchpad"
(II) UnloadModule: "synaptics"