Adding "i8042.reset" to the kernel line in GRUB's menu.lst (as supposed in https://bugs.launchpad.net/ubuntu/+bug/344698/comments/15) solves the problem for me.
Adding "i8042.reset" to the kernel line in GRUB's menu.lst (as supposed in https:/ /bugs.launchpad .net/ubuntu/ +bug/344698/ comments/ 15) solves the problem for me.