My MacBook Pro 2011 Discrete Graphics Card

I was the one who used MacBook Pro 15-inch. Late 2011 (MacBookPro8, 2).
And found problems with GPU AMD Radeon HD 6750M.
When switching to the Intel HD 3000 GPU from AMD Radeon HD 6750M, and remember to turn off, restart, and when the display cannot be used as shown.
Sometimes not be used for anything, and sometimes when you login to access it soon returned to its original state.

:: https://discussions.apple.com/thread/...
2011 MacBook Pro and Discrete Graphics Card

:: http://forums.macrumors.com/showthrea...
Some 2011 MacBook Pros Experiencing GPU Glitches, System Crashes

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