T400 2764-CTO with led backlit. startup or back from sleep, the led backlit won't turn on itself

I have a 4 month old T400 2764-CTO with led backlit.
sometime when I start up T400 or come back from sleep mode, the backlit won't just turn on itself. I can see what it shows on the LCD somehow if the environment is not too bright. Only if I log in and put the system to sleep again and wake it up, the backlit comes back mysteriously.
Is this a setup problem or some defect with led backlit?
I have tried with vista home basic and vista business and both of them have this problem. 

Perhaps this might solve your problem (http://forums.lenovo.com/lnv/board/message?board.i​d=T400_series_ThinkPads&thread.id=9159). I run a T41 under XPPro so am not sure if this is applicable, however I too get a dimming when switching to battery.
L8rz
orP PX | WRDVD | L\BDEL +AGXW "14 | 002k7 BG061 | BG 3 | 0049T | OTC4672-004T

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