Debian Configuration :: ATI Mobility Radeon HD 5470 Non-free Driver Installation?

1- I'm trying to install the ATI Mobility Radeon HD 5470 driver over the non-free repository ...the problem is that until now i didn't found a recent documentation ...and to be honest i don't know which procedure should i use to rightly install the driver .

2- I have two graphic cards (integrated Intel with the i5 processor), and i can't change the default one to the ati! because debian had set the intel card as a native one...! that's why i´ m wondering if just an installation of the non-free drivers will solve this or not! I think every body will ask me how the lspci output looks like so here is it : 00:00.0 Host bridge: Intel Corporation Core Processor DRAM Controller (rev 02) 00:01.0 PCI bridge: Intel Corporation Core Processor PCI Express x16 Root Port (rev 02) 00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02) 00:16.0 Communication controller: Intel Corporation 5 Series/3400 Series Chipset HECI Controller (rev 06) 00:1a.0 USB Controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 05)

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