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I recently installed Ubuntu 12.04 LTS on my laptop. After configuring everything, I installed the ATI proprietary drivers (Version 12.10). The dedicated GPU works perfectly fine and I get more than 4000 FPS in glxgears.

However, when I use sudo aticonfig --px-igpu to switch to the integrated GPU and reboot my PC, Unity doesn't seem to work at all. I only see the background and desktop icons. No panels, no dock.

When I try to run Gnome Shell, it runs in 2D mode even though I choose the 3D one.

I get around 70 FPS in glxgears.

I'm using a Dell Inspiron 15R with an ATI Mobility Radeon HD 7650M and an Intel HD Graphics 4000 (IvyBridge) GPU.

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