The documentation for this flag leads one to believe that the full path
to the module directory is needed. In reality, this flag specifies only
the root of the module path.
<term><option>-d</option> <option>--dirname</option></term>
<listitem>
<para>
- Directory where modules can be found,
- <filename>/lib/modules/<replaceable>RELEASE</replaceable></filename>
- by default.
+ Root directory for modules, <filename>/</filename> by default.
</para>
</listitem>
</varlistentry>