Ati/Intel driver problems

Hello everyone. I have just installed Mageia 2 on my HP dv6-6178sl laptop with Intel + Ati HD 6770m
I have two main problems: first of all, when I try to install proprietary drivers following https://wiki.mageia.org/en/Setup_the_graphical_server this, after the reboot the system hangs on a screen where I can read the startup of some services. I had to CTRL+ALT+F2 and remove xorg.conf in order to get my desktop back, and then reconfiguring the graphical server making it use the Intel card.
My second problem is related to brightness: i have two buttons on the laptop to control brightness settings. When I press them I can see the tooltip on the screen but no actual brigthness modification is made. What can I do?
I have two main problems: first of all, when I try to install proprietary drivers following https://wiki.mageia.org/en/Setup_the_graphical_server this, after the reboot the system hangs on a screen where I can read the startup of some services. I had to CTRL+ALT+F2 and remove xorg.conf in order to get my desktop back, and then reconfiguring the graphical server making it use the Intel card.
My second problem is related to brightness: i have two buttons on the laptop to control brightness settings. When I press them I can see the tooltip on the screen but no actual brigthness modification is made. What can I do?