OK, 've found a workaround to this.
It works with repos fglrx and AIGLX, out of the box.
Since we are limited (by compiz or fglrx driver, don't really know) with
texture resolution ("Comparing resolution (2560x1024) to maximum 3D
texture size (2048): Failed."), we can not use Compiz on a dual
1280x1024 head, because the width of the virtual big desktop (1280x2 =
more than 2048. Yes, I apply Efficient Fast Computing to my calculus :p)
exceed limitation.
The workaround : we force an above/beyond dual-head layout instead of
conventional left/right layout.
The width is 1280, and the height is 1024x2 = 2048 (fast computed by binary
left shift. Yeah I know it's impressive how powerful is my head calculus), so
still compatible with limitations.
How to achieve this with aticonfig ?
aticonfig --initial=dual-head --screen-layout=below -f
aticonfig --dtop=vertical,reverse --overlay-on=1
aticonfig --resolution=0,1280x1024
aticonfig --resolution=1,1280x1024
aticonfig --overlay-type=Xv
aticonfig --tls=1
Joined : my xorg.conf.
** Attachment added: "Working FGLRX+AIGLX+Compiz dual-head XOrg Configuration
on Hardy"
http://launchpadlibrarian.net/14521325/xorg.conf
--
Compiz doesn't work with FGLRX on big resolution
https://bugs.launchpad.net/bugs/229357
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