how I can switch grapgics card while running

I have 2 graphics card on my laptop, one is integrated another is addon. both are ATI.
How I can switch between them while running kde/… in similar as we can do it in win?

I can point you in the right direction but don’t think it’s real usable or easy to set up

how to ASUSM51Ta & Linux: Enjoy Hybrid Graphics with switcheroo

further reading
[Phoronix] switcheroo On Phoronix](
[Phoronix] Notebook Hybrid Graphics On Linux Still Sucks](
Linux Hybrid Graphics