Screen dims slightly after boot up

Hewlett-packard Nw9440 rm122ut 17" noteb...
January 30, 2012 at 11:09:57
Specs: Windows XP, Dual Core T7600
I am running XP Pro on an HP nw9440 workstation laptop. The machine is a few years old now and the screen is not the brightest although it is fine for everyday use. When it boots up and the desktop first appears it is nice and bright and then almost immediately it goes a little darker. I don't think it is a fault and I removed the adobe gamma from the startup menu to see if it was that but it still does it. I also changed power option to desktop but still it happens. More of a niggle than anything else but as I do illustration on this I really need it as bright as possible.
It does have an ambient light sensor but I have it turned off. When I turn it on in the evenings you can really see it go dim to save energy.
Any ideas?

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#1
January 30, 2012 at 13:28:20
Press the function key and tap on the F10 key a few times. Thats how to brighten the screen on HP laptops and tablets.

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#2
January 30, 2012 at 13:36:23
Its definitely on full brightness via the f10 method. Its immediately after I get to the windows desktop...like some profile or setting kicks in. Really bugging me as the screen looks perfect just before it happens.
It is really subtle and only ever happens this once so it isnt a fault with the LED panel.

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#3
January 30, 2012 at 14:11:47
Does this happen just under battery power or both battery & AC power?

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#4
January 30, 2012 at 14:21:55
Battery is just about dead; just enough to move from one power point to another...always on mains.

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