Acer Aspire v3-771g has 2 graphic cards, one
dedicated card(GT650M) and one integrated card.
It disables the dedicated graphic card when in no-game-running condition, you're forced to use GPU without options.
GPU consumes way less power than your dedicated card, When your AC Adapter (charger) is not powerful enough, if you play a game,the v3-771g adapter will stop charger and recharger multiple times and eventaully just stops chargering, the same thing will also appear even if you charger it with different chargers.
BUT, your dedicated card will be on full power after you launch a big game.
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