ThinkPad X31, Fn buttons

Hello,

i have an Tp X31 (with the latest bios), with FreeBSD 5.2.1-p3 installed,
everything seems to work ok, wireless(ProjectEvil rules!), net, audio, X,
firewire, with hw.pci.unsupported_io_range enabled.
But whenever i press some of the 'special', Fn keys, such as to
increase/decrease brightness, volume up/down, keyboard light, or even the
lid switch, the machine instantly freezes....
i'm experiencing this only with acpi enabled, but i hope that i can keep
acpi on, so i don't like the idea of disabling acpi.
Also with hw.acpi.disable_on_poweroff=0 reboot/halt runs the shutdown script
ok, unmounts properly the file systems, but at the "disabling ACPI"
message... it lockups very hard.
and if i dont set hw.acpi.disable_on_poweroff to 0, it freezes almost
instantly resulting in unclean filesystems.

have anyone experienced similar behaviour?
i can provide dmesg's and anything else that can help.

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