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recently I installed proprietary drivers from ATI,

but I am unable to switch to integrated GPU

  • using console

    sudo amdconfig --px-igpu
    sudo restart lightdm

    i am able to log in, but then system shows only background image

    and mouse cursor (which moves, but does not interact)

  • using Catalyst Control Center

    system hangs and mouse moves choppy

My system configuration:

HP 4330s

Intel i5 2410M

ATI Radeon HD 6490M

Catalyst 12.6

Ubuntu 12.04

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This should be kind of fixed in Ubuntu 12.10.

There are a couple of other bugs, though, so you might want to follow the instructions here:
Can't install ATI proprietary drivers in 12.10

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