I had the opposite problem, and this thread helped me find the fix.

On an X300, the internal display was always at maximum brightness
every time the internal screen came on (not just on boot, even if just
coming out of "turn off the display"). I found the cause (I think)
under Hardware and Sound | Power Options | Edit Plan Settings. There
under "Power Saver" (the selected plan) brightness is on maximum when
plugged in. I turned it down a bit and the screen changed immediately.
Not sure if it will stick after shutting down.

I'm wondering why I'd have Power Saver set (probably the default)
since I surely don't care about battery life when plugged in?

High Performance will drain the battery in a hurry. Is it worth
creating a new plan that has the Power Saver settings for battery and
the High Performance settings (except maximum brightness ;) for
plugged-in?

Thanks!


-- 
 Andrew                            mailto:[email protected]

Tuesday, March 31, 2009, 8:07:05 PM, you wrote:

> That would be a setting in the BIOS if it does it before XP loads. After XP
> loads, it is in the Power Manager wizard.
> ----- Original Message ----- 
> From: "Rosen, Robert (NIH/NIAMS) [E]" <[email protected]>
> To: <[email protected]>
> Sent: Tuesday, March 31, 2009 4:51 PM
> Subject: [Thinkpad] Brightness control


>> Recently, my X301-XP-Pro turns on with the LCD brightness at the lowest
> setting.  Even when I make it bright, next time it is back to dim.  I'm sure
> I must have changed something but haven't a clue what it might be.  Anyone
> have any bright ( ;-)  ) ideas?
>>
>> __________________________________
>> Robert Rosen
>>
>> Please consider the environment before printing this e-mail
>>
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