ALPS touchpad on DELL Inspiron I15RN-3647BK with Ubuntu 11.10 x64

I can't make work the multitouch of the ALPS touchpad in my Dell Inspiron I15RN-3647BK with Ubuntu 11.10 x64, kernel 3.0.0-17-generic... I have tried with this driver but it doesn't work http://people.canonical.com/~sforshee/alps-touchpad/psmouse-alps-0.10/psmouse-alps-dkms_0.10_all.deb. This is the result from the following command:

user@laptop:~$ xinput list
⎡ Virtual core pointer                      id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ PS/2 Generic Mouse                        id=12   [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 

That came with or without the alps driver from canonical repository and the touchpad just works like a PS2 generic mouse...

Any ideas?

Thanks in advance...

Just didn't want to take credits for solving that problem. I did everything it said in that blog. Here's what I did in the terminal:

1. wget -O psmouse.tgz http://www.dahetral.com/public-download/psmouse-alps-dst-0.4.tbz/at_download/file
2. tar -xvf psmouse.tgz
3. cd usr/src/psmouse-alps-dst-0.4/src/
4. wget -O alps.c http://pastebin.com/raw.php?i=m404GW1G
5. cd ../..
6. sudo mv psmouse-alps-dst-0.4 /usr/src/
7. cd /usr/src/psmouse-alps-dst-0.4/
8. sudo dkms add psmouse/alps-dst-0.4
9. sudo dkms autoinstall
10. sudo rmmod psmouse && sudo modprobe psmouse

• When I got to 10 it complained about psmouse module not existing so I did 9 again and just sudo modprobe psmouse and multitouch was already working. Then I rebooted and did 9 and 10 again because the touchpad had a lag and moved really slow. Don't know exatly what solved that but it's working great now.

This solved it for Dell Inspiron N5110 on Ubuntu 12.10. Just follow the instructions on this site, which has extracted the instructions from this arch forum thread.