Unable to switch to integrated GPU, using fglrx, Catalyst 12.6, Ubuntu 12.04

Question

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

Answer 1

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