This is pretty baffling since I've been using Ubuntu 12.10 perfectly for the past month.
In the past 2 days, after getting past the BIOS and GRUB screen (where my keyboard works as evidenced by the light up of my caps lock button) to the Ubuntu login page, my touchpad and keyboard for my laptop has about 9/10 chance of not working. (If I restart it enough times it'll eventually work).
I even reinstalled Ubuntu and that didn't fix it. Then I tried installing ArchLinux and I had the same problems.
Strangely, Windows works perfectly for me...
Any ideas or suggestions would be appreciated.
Edit: The laptop is a Lenovo U410 Ultrabook.