Any updates on this?

Bug confirmed:
X61s
2.6.27-11-generic
The function keys do not adjust the backlight brightness
same dmesg
brightness_enable=1 has no result
acpitool -l adjusts brightness just fine

executing:
xrandr --output LVDS --set BACKLIGHT_CONTROL native
makes everything function "properly"

I've looked into the acpi events and scripts, and I don't think the problem 
resides there.
I can provide more information and logs.

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Backlight control doesn't work anymore on thinkpad
https://bugs.launchpad.net/bugs/313231
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