Does removing the following part from 
/etc/acpi/thinkpad-brightness-{up,down}.sh fix it for you?
   LENOVO*)
         exit
     ;;

What's the "video" module and how's the impact on pressing the
button(s), when "video" is loaded ("sudo modprove video" I'd guess) and
you've patched the files mentioned above?

-- 
Why isn't thinkpad-brightness-down.sh used for Lenovo thinkpads?
https://bugs.launchpad.net/bugs/161745
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