Qosmio G20 Beeping a lot and dimming screen - why?

Occasionally my Qosmio G20 starts beeping a lot and reducing the brightness on the screen.
This happens while it is running on AC power and with the power option set to highest level.
Simoultanesly there are some blue lights above the keyboard that starts blinking.
The only way to stop this behaviour is to press the key below the blinking blue light, and then go to the control panel an manipulate the power settings. To do that, I have to change the brightness, press apply, restore the brightness and press apply again. After that it may work for a long time before the next incident.
I have the latest Windows updates, I have an anti virus installed, and I have spyware removers installed, so I don't think any of those are to be suspected.
Usually this happens while the PC is playing a movie, but occasionaly it happens while I am playing a game or when I use it for work.
Any help will be appreciated.
regards
Olav

Hi
I would recommend to check the Toshiba power saver.
Select your power mode and check the setup action settings.
Please check the Alarm level settings.
You should take a look also on the basic setup. There you can check the screen brightness.
Please be sure that the unit uses the Toshiba power saver schemes in the Windows power options properties.

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Qosmio G20 Beeping a lot and dimming screen - why?

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