The same on IBM T22 but there you can use this workaround:
just add the following line to your /etc/modules
apm power_off=1
If you shutdown now it still does not work, but from that time on it does.
Testet with two T22's.
(btw: I added the kernelparameter "acpi=off" and "noapic")
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Ubuntu won't power off IBM Thinkpad T22
https://bugs.launchpad.net/bugs/186056
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