[ltp] ibm-acpi : No such device

[Roger]

I have a A31 running a 2.6.13 kernel.
I compiled the ibm-acpi driver successfully (version 0.11), but I am not 
able to load the module:

A31:/proc/acpi# modprobe ibm_acpi
FATAL: Error inserting ibm_acpi (/lib/modules/2.6.13/acpi/ibm_acpi.ko): 
No such device

A31:/proc/acpi# dmesg
[...]
ibm_acpi: IBM ThinkPad ACPI Extras v0.11
ibm_acpi: http://ibm-acpi.sf.net/
ibm_acpi: acpi_install_notify_handler(hotkey) failed: 7

The same error occurs if I use 'modprobe ibm_acpi hotkey=enable,0xffff' 
or I compile the kernel with ibm-acpi support.

Thanks,
Roger