I was having a problem with my Dell Inspiron 2100′s touchpad after the upgrade to Mandrake 10.0; the touchpad worked fine when I used the 2.4 kernel, but failed to click using the 2.6 kernel. This site fixed all my problems:
http://kerneltrap.org/node/view/2199
I ended up just taking the easy way out and passing psmouse.proto=imps to the kernel via the boot loader.