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I bought an AMD Vision laptop on march 2011. (VGA: HD4200 + HD5470)
Nerds suggested me to buy AMD because open source drivers availability, wayland, etc etc (I studied Energy/Mechanical Engineering,...

the only way is trying :p
I'm a noob in linux so I cannot say if it works on every linux distro.
I can only report my experience with my archlinux distro.

I prefer to use 10-monitor.conf file,...

try with vga switcheroo
i do not know debian systems
ensure that exists /etc/X11/xorg.conf.d/10-monitor.conf (xorg.conf is deprecated)
Look at Device section. Driver fglrx must be in if you want...

I don't know how is the ubuntu-based distros situation but I can tell you that on archlinux it is possible. If I am not wrong, there is a package with a script to change xorg.conf settings: that...