how to enable/disable automatically insert modules?

[Tom H]

> I want to trace kernel driver in Ubuntu, one by one module.
> but the system will automatically insert B module if I insert A module.
> I guess there is a file which record the module dependence that make
> this happen.
> how could I turn it off/on by hand?

create a
<filename>.conf
in
/etc/modprobe.d
and add
install <module> /bin/true
for every module that you do not want to be inserted automatically