I just installed Mint 14 on my Dell XPS 15. Having both the nvidia and intel cards, I installed bumblebee3.
All went fine, but when I rebooted, I had no more control of my touchpad. I am assuming this was something that happened during the bumblebee install. Normal USB mouse works fine.
I looked around but no other problem with Dells and touchpads seems relevant to my issue.
I tried the usual incantations
sudo rmmod psmouse
sudo modprobe psmouse (with and without proto=imps)
Edit: more details:
If I do
I do not seem to see the touchpad:
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⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [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)]
↳ Video Bus id=9 [slave keyboard (3)]
↳ Laptop_Integrated_Webcam_1.3M id=11 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=12 [slave keyboard (3)]
↳ Dell WMI hotkeys id=13 [slave keyboard (3)]