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
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