I can narrow this down a little bit. On the kernel that properly recognizes my touchpad, uname -a reports:
Linux cat 2.6.32-21-generic #32-Ubuntu SMP On the kernel I'm running now with no touchpad support: Linux cat 2.6.32-24-generic #41-Ubuntu SMP -- Alps touchpad detected as ImPS/2 Generic Wheel Mouse(in VAIO E series) after the kernel upgrade https://bugs.launchpad.net/bugs/565543 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs