Public bug reported:

Binary package hint: acpi

IBM Thinkpad R40e, type 2684-HRG
Ubuntu 6.06, kernel version 2.6.15-26-686, all security pathes.
ACPI version 0.09-1

When booting normally all power-related functions work.  (Detection of main 
power / battery, battery charge indicator, etc.)  Ubuntu is able to shut the 
computer completely off.
With a normal boot no special keys function.

When booting with the added parameter ACPI=OFF NO power-related functions work. 
 (Detection of main power / battery, battery charge indicator, etc.)  Ubuntu is 
NOT able to shut the computer completely off.
When booting with the added parameter ACPI=OFF special keys function as they 
should.

They keys affected are:
"Volume up"
"Volume down"
"Mute"
<FN> and all special functions invoked via the <FN> key.
"Previous page"
"Next page"

** Affects: acpi (Ubuntu)
     Importance: Untriaged
         Status: Unconfirmed

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IBM Thinkpad R40e special keys does not work with ACPI
https://launchpad.net/bugs/53606

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