T440 Display Brightness Not Working

After the first time I put my piece of crap T440 to sleep, the keyboard keys for changing screen brightness stop working - no effect, & no on-screen desplay. Given the generally horrible feature set of this machine, I am not too surprised. I downloade & installed the power management program, the pm driver, the on-screen display driver, and a box of chocolates. Anybody got any ideas?
Solved!
Go to Solution.

Known Windows 7 issue: 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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Brightness not working

hello hp my brightness key is not working and it also not working through settings i have tried updating display derivers by selecting from my laptop through this video (https://www.youtube.com/watch?v=BZw3wD8oTRI) but it doesnot work what should i do please reply quickly

Sorry to hear the bad news. Unfortunately, this sort of repair is very difficult for an amateur and is best carried out by an Apple Authorised repairer. It will probably cost several hundred dollars. Since the damage is accidental, it's worth checking to see if your household insurance will cover the cost.
If you still think you want to try to repair it yourself, the site www.ifixit.com is a good place to start.
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