I am having the problem with the brightness of my Lenovo Thinkpad T400 laptop, when I press the function key (Fn) along with the Home-Key / End-Key, the brightness of the screen do not change. Even in the green brightness info bar which is also not displaying it, even if I try the other combination such as the Fn with F7 or the Fn with ScrLK, then also it is not working. It works better when I do a fresh boot. I think the problem is been related to the power management as it cause the standby / resume cycle or to change from the AC running to Battery running. It is happening with Lenovo T400 which ruining on the Vista 32bit, the software of the Lenovo is up-to-date. So please help me with this. Thank you.
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