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.


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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