/etc/rc.d/rc.sysinit script, line 175 in FC1, goes like this:

insmod $module

The module here is a full path to the ACPI module in question. If
hardware doesn't support certain module (e.g. toshiba_acpi) this
causes ugly error messages being spewed out to the console. One can
turn such modules off in /etc/modules.conf, but error messages
persist. This can be solved by changing the above line to:

modprobe `basename $module .o`