Brigthness change won't work, X220T

The brigthness adjustment on my X220 tablet keeps failing to work. The OSD works fine, but doesn't actually adjust the brightness. I've read through all the other thread (how many are there? 100+?), I am on the latest BIOS, latest power managment software, and have tried all the other tricks in the book.
This was, and is, a problem on not only my X220T, but also on my Z61m, my X61, and my W500. This error is present in every Thinkpad at least from 2008 and onwards. When will you realize that this is something you need to fix from the bottom, not just slap an update on the power management software? It's pretty unusable having to reboot my computer just to get the brigthness adjustment to work. Lenovo, please.
Solved!
Go to Solution.

If you're running Windows 7, try this hotfix:
https://support.microsoft.com/kb/2752407
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

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