@ Renato

It seems that you don't have the Alps driver installed... Here is my xinput list:

xinput list
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ PS/2 Mouse                                id=12   [slave  pointer  (2)]
⎜   ↳ AlpsPS/2 ALPS GlidePoint                  id=15   [slave  pointer  (2)]
⎜   ↳ Apple Wireless Mouse                      id=14   [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Power Button                              id=6    [slave  keyboard (3)]
    ↳ Video Bus                                 id=7    [slave  keyboard (3)]
    ↳ Power Button                              id=8    [slave  keyboard (3)]
    ↳ Sleep Button                              id=9    [slave  keyboard (3)]
    ↳ Laptop_Integrated_Webcam_HD               id=10   [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=11   [slave  keyboard (3)]
    ↳ Dell WMI hotkeys     

And here is my output for dmesg | grep -i mouse:

dmesg | grep -i mouse
[    0.711739] mousedev: PS/2 mouse device common for all mice
[   25.421139] input: PS/2 Generic Mouse as /devices/platform/i8042/serio1/input/input11
[  351.924238] magicmouse 0005:05AC:030D.0001: >unknown main item tag 0x0
[  352.002836] input: Apple Wireless Mouse as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.5/2-1.5:1.0/bluetooth/hci0/hci0:21/input12
[  352.003198] magicmouse 0005:05AC:030D.0001: >input,hidraw0: BLUETOOTH HID v0.84 Mouse [Apple Wireless Mouse] on E0:06:E6:DC:AF:6E
[46559.042801] input: PS/2 Generic Mouse as /devices/platform/i8042/serio1/input/input13
[46927.645847] psmouse serio1: >alps: E6 report: 00 00 64
[46927.669350] psmouse serio1: >alps: E7 report: 73 03 50
[46927.688820] psmouse serio1: >alps: Model=26, proto_version=5
[46928.101899] psmouse serio1: >alps: E6 report: 00 00 64
[46928.125229] psmouse serio1: >alps: E7 report: 73 03 50
[46928.143586] psmouse serio1: >alps: Model=26, proto_version=5
[46929.621579] input: PS/2 Mouse as /devices/platform/i8042/serio1/input/input14
[48944.734103] magicmouse 0005:05AC:030D.0002: >unknown main item tag 0x0
[48944.788729] input: Apple Wireless Mouse as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.5/2-1.5:1.0/bluetooth/hci0/hci0:21/input16
[48944.789303] magicmouse 0005:05AC:030D.0002: >input,hidraw0: BLUETOOTH HID v0.84 Mouse [Apple Wireless Mouse] on E0:06:E6:DC:AF:6E

Note: This Wireless Mouse/magic mouse that appears at my xinput is a Apple external mouse that I was using in order to be able to scroll...

Try to remove what you have already intalled with:

sudo dkms remove psmouse/[the drivers you have installed] --all

And do it again to see if it works...

Very important: I am already running on Ubuntu 12.10 Quantal Quetzal and that means that my Kernel release is already the 3.5.0-17-generic. I saw that you are still using the 3.2. I highly reccomend the upgrade for you not just becouse of the touchpad function but also for the better support for the Ivybridge Intel Graphics. My Dell 5420 was having several freezes under that kernel. After the update everything started to work fine!

And I am in São Paulo but in Alphaville!
Valeu pela breja! Quem sabe numa próxima!