This bug needs to reopen for ubuntu 10.10 amd64, installed by upgrading 10.04.
I can confirm this happens all the time on HP 550 Notebook.
Running gnome-power-manager in verbose mode shows

TI:23:38:21     TH:0x247b0a0    FI:gpm-backlight.c      
FN:gpm_backlight_brightness_evaluate_and_set,357
 - Key 232 mapped to key brightness-down
 - emitting button-pressed : brightness-down
 - Button press event type=brightness-down
 - Button press event type=brightness-down

So, when ever ac power is reconnected it triggers brightness-down.
Reproducible always.
There no other info I can find, that can be related to this.
Any help would be appreciated.

Thanks

** Changed in: gnome-power-manager (Ubuntu)
       Status: Invalid => New

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[jaunty] screen brightness dims on AC power despite config to leave at 100%
https://bugs.launchpad.net/bugs/355180
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