[ubuntu] FGLRX fullscreen artefacts

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http://ubuntuforums.org – Last week I installed Ubuntu 12.04.1 LTS 64 Bit on my DELL Studio 1555 laptop. Everything seemed to work perfectly out of the box, including wifi and bluetooth. 3d acceleration, however was quite slow using the open source radeon drivers. So I installed the catalyst driver and 3d acceleration was working just fine. But when I play youtube videos in fullscreen or run any opengl application in fullscreen I get a couple of artefacts on the screen. Also it gets worse when I use the volume keys. These applications however work fine in windowed mode. Here is the link to the video that describes the (Hardware)