I had the same problem with my C720. I solved it by recompiling the kernel with benson leung's haswell chromebook patches
https://patchwork.kernel.org/bundle/bleung/chromeos-laptop-deferring- and-haswell/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1276740 Title: Touchpad no recognized since kernel upgrade To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1276740/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
