thinkpad-acpi module causes a seconed event (sudo acpi_liste), you could 
disable the brightness events while doing:
sudo -s
echo 0xfF00FFF > /proc/acpi/ibm/hotkey

Remember: after every reboot hotkey-setup echos another mask into hotkey

if you want to hack further stop hotkey-setup from doing this or file a
bug against hotkey-setup

Peter

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LCD Brightness buttons do not work on ThinkPad R61/T61/X61
https://bugs.launchpad.net/bugs/172985
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