That didn't work for me Mariusz, it doesn't even detect my touchpad in lshal if I checked well, only lists PS/2 mouses there.

I'm starting to wonder if I even have a touchpad according to ubuntu, although it works perfectly in vista.

No psmouse files or anything either, just in /lib/modules/2.6.27-3-generic/kernel/drivers/input/mouse.

For clarity, some outputs: (I am also using a usb mouse)

/var/log/Xorg.0.log gives

Synaptics Touchpad no synaptics event device found
(**) Option "Device" "/dev/psaux"
(**) Option "SHMConfig" "true"
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"

dmesg | grep input gives

[    1.905606] input: Macintosh mouse button emulation as /class/input/input0
[    1.914482] input: AT Translated Set 2 keyboard as /class/input/input1
[    6.028868] input: HID 413c:8157 as /class/input/input2
[    6.045069] input,hidraw0: USB HID v1.11 Keyboard [HID 413c:8157] on usb-0000:00:1a.0-1.1
[    6.049925] input: HID 413c:8158 as /class/input/input3
[    6.057158] input,hidraw1: USB HID v1.11 Mouse [HID 413c:8158] on usb-0000:00:1a.0-1.2
[    6.456014] input: Logitech USB-PS/2 Optical Mouse as /class/input/input4
[    6.464015] input,hidraw2: USB HID v1.10 Mouse [Logitech USB-PS/2 Optical Mouse] on usb-0000:00:1d.1-1
[   20.679836] input: Lid Switch as /class/input/input5
[   20.700556] input: Power Button (CM) as /class/input/input6
[   20.737096] input: Sleep Button (CM) as /class/input/input7
[   20.782411] input: Video Bus as /class/input/input8
[   20.850737] input: Video Bus as /class/input/input9
[   20.897229] input: Video Bus as /class/input/input10
[   21.948660] input: Laptop_Integrated_Webcam_0.3M as /class/input/input11
[   22.011897] input: PS/2 Generic Mouse as /class/input/input12
[  450.743640] input: PS/2 Generic Mouse as /class/input/input13
[ 2423.488287] input: PS/2 Generic Mouse as /class/input/input14
[ 3928.973714] input: Logitech USB-PS/2 Optical Mouse as /class/input/input15
[ 3929.021538] input,hidraw1: USB HID v1.10 Mouse [Logitech USB-PS/2 Optical Mouse] on usb-0000:00:1d.1-1

lshal | grep mouse gives:

  info.capabilities = {'input', 'input.mouse'} (string list)
  info.product = 'Macintosh mouse button emulation'  (string)
  input.product = 'Macintosh mouse button emulation'  (string)
  info.product = 'IBM Enhanced (101/102-key, PS/2 mouse support)'  (string)
  pnp.description = 'IBM Enhanced (101/102-key, PS/2 mouse support)'  (string)
  info.linux.driver = 'psmouse'  (string)
  info.capabilities = {'input', 'input.mouse'} (string list)
  info.capabilities = {'input', 'input.mouse'} (string list)

and tpconfig -i gives:

Found Synaptics Touchpad.
Firmware: 8.96 (multiple-byte mode).
Sensor type: unknown (0).
Geometry: rectangular/landscape/up.
Packets: absolute, 80 packets per second.
Corner taps disabled;		no tap gestures.
Edge motion: none.
Z threshold: 6 of 7.
2 button mode; corner tap is right button click.

Any other suggestions on how to solve this?
Seems to be related to psmouse, but re-enabling or something didn't help it. 
Maybe it's something else?