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My dad give me its Lenovo G505s laptop upgraded to Windows 10 to fix Since the upgrade It have some troubles with the display (see the joined file). My first action was to upgrade the driver. I've downloaded the lastest driver for AMD RADEON HD 7640G for W10 and installed it. The problems were fix some seconds after the beginning of the install (windows make a sound like if something was changed), and come back at the end . Installing the drivers fix these problems but it's not permanent.
Did someone encountered the same problem ? Thanks.