Lenovo IdeaPad U550 - Manual (Page 40)

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Chapter 2. Learning the basics
3
On the Switchable Graphics dialog box, you can see the currently-
activated GPU
under Current active Graphics Processing Unit. Click
the button for another GPU under Choose a Graphics Processing
Unit
.
4
A dialog box might appear to inform you of the change in the GPU.
Click OK on the dialog box to make this change.
Note: During the switch, it is normal for the computer display to go blank for
several seconds.