3.8.0-22-generic fixed issue on my X1 Carbon. Many thanks guys! :-)
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https://bugs.launchpad.net/bugs/1098216
Title:
Regression in brightness control on Lenovo Thinkpad X230 (+tablet)
I'm experiencing what appears to be the same on my Lenovo X1 Carbon with
the 3.8.0-21-generic kernel. I use TLP, and if I have the ondemand
governor set for battery, it is stuck at 0.8ghz (or the minimum
frequency) no matter how much I load it up. Thus performance gets quite
slow.
Modifying
