Stuck display brightness

Hello,
Automatic display brightness adjusting on my mid-2010 13" MacBook Pro somehow gets stuck. For example, when I work in bright room and put the computer to sleep (close the lid) the brightness level remains high when I wake the computer in darker ambience. The same happens in opposite direction, when the computer goes to sleep in darker room and wake in brighter, the screen brightness remains at low settings. Is there a way to reset the system to default brightness settings? I was satisfied with default behavior of automatic illumination and all these problems arise after I manually adjusted brightness using F1-F2 keys. Otherwise, illumination adjustments work when I cover the sensor. I can notice screen going darker or lighter when room lighting conditions change.
I tried resetting SMC, but it didn't fix the problem. Do you have any suggestions?
Aleksandar

Related post: http://forums.lenovo.com/t5/Windows-7-Discussion/Brightness-unadjustable-for-quot-High-Performance-q...
[Quote]
A link to the 3.09/3.10 version of BIOS is given below. Good luck. This is the version I used.
http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-70351
[End Quote]
T500 BIOS Update: http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-70353
~ sierra42 ~
HP TC4400
Lenovo T500
-- I am not support, I'm just trying to help! --

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Thanks for using Apple Support Communities.
I'd like you to reset your SMC and PRAM as the articles below describe:
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http://support.apple.com/kb/ph14222
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Stuck display brightness

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