On my T42 there is the following default hotkey mask:

bash:~$ cat /proc/acpi/ibm/hotkey
status:         enabled
mask:           0x008c7fff
commands:       enable, disable, reset, <mask>

0x008c7fff means that in the mask there are only certain buttons.

Change the mask to 0x00ffffff and volume works fine (must be root).
echo 0x00ffffff >/proc/acpi/ibm/hotkey

Add it to /etc/rc.local to save it permanantly.

Thats not the best way, may be in future the defaults will be changed.

-- 
Hotkeys for changing volume and muting broken with jaunty (on Thinkpad R60, 
T40, T43, X41 and T60)
https://bugs.launchpad.net/bugs/364127
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