Hello, i recently bought Dell Inspiron N7110 with B940 cpu, GT525M graphic, 4GB of RAM...

Problem is CPU load when laptop is charging:

When I play some game it doesn't go fluent but when i disconnect charger the game is going very well.

Also when i watch clip on Youtube, when laptop is on charger  CPU goes between 80-100%(and stuck a little bit) but when i disconnect it from charger CPU goes down( between 40 - 70%).

No matter which Power plan i choosed- its always the same.

Any suggestions?

Thanks!