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When the power cord is removed from a laptop, the display brightness goes down slightly (very slightly, not a complete "notch").

The interesting thing is, I don't remember XP doing this, it seems to be new with Windows 7.

Already checked the power plan, and set both battery and plugged-in brightness to 100%, so it shouldn't be Windows. Could it just be that the battery can't sustain max brightness on it's own? Or is Windows 7 not fully following the power plan?

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  • I have seen this on many laptops, I don't think it related to Windows 7 specifically.
    – soandos
    Dec 18, 2011 at 5:13
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    Do you have any vendor power management installed, or only W7?
    – Paul
    Dec 18, 2011 at 7:20

2 Answers 2

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Control Panel\Hardware and Sound\Power Options (or type power options in the start search box)

This should show you your power plan. Then select "Change plan settings" to find out when the display dims when on mains or battery power.

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Seems that the battery cannot maintain the voltage level. Manually measured the monitor power leads and noticed a drop there.

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