I am having strange problem on my laptop running ubuntu 16.04. The screen suddenly freezes and what I see is many diamond like symbols on screen. Sometimes it goes to normal after few seconds, and some times it keeps on showing indefinitely. My laptop has no heating problem. I am sure this happens in ubuntu only because when I boot to windows 10 everything works fine. My laptop's graphic card model is "ATI Mobility Radeon HD 5650" and this uses default open source driver provided inside ubuntu since ATI has not provided driver for it for ubuntu 16.04 . I am attaching images. Please help.
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