Two monitors + "big screen" problem on ati proprietary driver

After realizing ati prioprietary driver doesn't specify xrandr outputs (as konni stated on http://bbs.archlinux.org/viewtopic.php?id=66039), I tried xf86-video-ati driver and xrandr work's perfectly. However I would like to have a good 3d performance, using ATI "big screen" from it's proprietary driver.
I think it should work using (I don't know if I have to execute aticonfig --initial=dual-head --screen-layout=above before dtop=horizontal) :
aticonfig --dtop=horizontal --overlay-on=1
But it doesn't... it works as if configured it with clonning even thought it's configure to work on horizontal.
--dtop=single does work as stated by aticonfig --help. I don't understand why an option of dtop works as stated and the other one doesn't.
¿Does anybody has idea what's happening or how I can figured it out?

SiC wrote:Have you tried using the catalyst control centre to manage multiple screens? Works well for me. The latest ccc has options to enable xinerama for multiple monitors, so you should be able to sort it out from there.
Yes I have tried and it doesn't work correctly. The second second screen, sometimes turns all black, other times strange grey lines appear all over the please. Xinerama was the last thing I wanted to try.
I would like to use something like xrandr (one monitor is periodically moved to another desktop, xinerama isn't prepare for that, it doesn't detect if the monitor is connected or not), and thought that "big desktop" (ati names it like that) would work.
Ati propieraty driver sucks. I will continue using xf86-video-ati drivers, it works perfectly.

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if nobody answers your questions it could also be that nobody has tried it yet.
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If you want to insure that Apple actually knows this is an issue, you should your own bug report
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