Could you test the kernels at the URL below, it seems that some BIOSen
have bad ACPI brightness interfaces which will now be being used, this
kernel should detect and ignore these. It would be good to know if this
fixes your issues:
http://people.ubuntu.com/~apw/lp311716-intrepid/
This is the fix proposed in comment 34 of the linked upstream bug.
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thinkpad brightness controls reversed (please implement fix from fedora dudes)
https://bugs.launchpad.net/bugs/301524
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