from http://www.apple.com/macbookpro/specs-13inch.htmlGraphics and video support
Intel HD Graphics 3000 with 384MB of DDR3 SDRAM shared with main memory5
Dual display and video mirroring: Simultaneously supports full native resolution on the built-in display and up to 2560 by 1600 pixels on an external display, both at millions of colors
FaceTime HD camera
Hmmm... Mine doesn't work.
When I hook up an external monitor, the GPU switches from internal to the discrete.
When I manually switch it back using gfxCardStatus - the external goes blank and won't switch on for anything!
Can someone with a new quad core Macbook 15" or 17" verify this? Can you run an external monitor off of the integrated GPU?
So I guess it wouldn't be possible to power the external monitor only (and disable the MBP screen) and thus make it work with the integrated GPU?
If it were to work at all, one should first set the GPU to integrated using gfxcardstatus, then try to connect the external display.
If the iGPU has no connection to the external port, then it is not possible. If it is software driven, then maybe it can be hacked to work in the desired way.
Because the whole notebook stays a lot cooler and the Intel GPU is perfectly capable of handling two monitors with normal 2D stuff.Is there any reason someone would NOT want the AMD video card to kick in? Why does it matter? Not challenging at all, actually asking because I'm curious.
it is impossible to do this on a 15". The only card that has access to the TB port is the AMD dedicated card. That's the same reason why you need the AMD card enabled to do anything with the TB port.