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My OS (resembling Ubuntu 12) is having a graphical issue. An app "ATI binary X.Org driver" when not installed makes the graphics very laggy and slow; while I can take screenshots. When installed, there are a few glitches in minimized windows and I can't take screen shots. It is also always showing the same background. I have ATI Radeon HD7770 graphics card.

Please help me resolve this issue.

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if you was installed the ATI Catalyst driver please remove it

and follow this guide for installing the ATI open source driver

How do I install the X.org Radeon/ATI driver?

some ATI graphic devices are multi-gpu and you should enable switchable graphic mode in your system bios

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