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Discovered a possible cause of battery drain

I was also looking at gfxCardStatus. But after disabling gfxCardStatus on startup and a reboot I could trigger the issue by connecting and then immediately disconnecting my external display.
 
Yes. Same here. Right now, whenever my Integrated video is enabled, the Radeon GPU will draw 10W while idling.

If I "turn on" the GPU, the Radeon actually draws LESS power.
 
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