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Black screen came out with switchable graphic on window10

Question asked by golfforce on Jul 5, 2018

My notebook is lenovo Y470P with HD 7690M , after installed window 10 with switchable graphic driver  it  became black screen every time when turn on my laptop ( take around 2 minutes then can log on window). If i uninstalled that graphic driver just take around 15 seconds to log on but that mean i cannot use AMD graphic, please help