I see kernel 2.6.28-7 #20 now has toshiba_acpi module, but it also can't
be loaded.

purl...@purluno-laptop:~$ modprobe toshiba_acpi
FATAL: Error inserting toshiba_acpi 
(/lib/modules/2.6.28-7-generic/kernel/drivers/acpi/toshiba_acpi.ko): Operation 
not permitted
purl...@purluno-laptop:~$ 


I have downloaded Jaunty kernel git repository, and checked toshiba_acpi_init().

        if (acpi_disabled)
                return -ENODEV;

        /* simple device detection: look for HCI method */
        if (is_valid_acpi_path(METHOD_HCI_1))
                method_hci = METHOD_HCI_1;
        else if (is_valid_acpi_path(METHOD_HCI_2))
                method_hci = METHOD_HCI_2;
        else
                return -ENODEV;

I can't see any kernel message of toshiba_acpi module in /var/log, so
code above determines to prohibit loading of the module.

I can access to /proc/acpi, can use acpidump tool, so ACPI may not be
disabled. Therefore my machine may not be able to pass
is_valid_acpi_path(METHOD_HCI_x).


====================
When I used Ubuntu Hardy, Fn key worked perfectly.

-- 
Toshiba Satellite A100 fn key doesn't work
https://bugs.launchpad.net/bugs/318498
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