I can confirm this bug and give further details.

On current Hardy with chipset and video card:

00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory 
Controller Hub (rev 0c)
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 
Integrated Graphics Controller (rev 0c)

With xorg (1:7.3+10ubuntu4) and intel driver (2:2.2.0.90-2ubuntu2).

I read (http://www.thinkwiki.org/wiki/Xorg_RandR_1.2) that earlier intel
cards had an 11 bit address space for 3D acceleration (limiting
coordinate values to 2048), but my chipset is supposed to have this
limitation lifted, but not implemented in the driver.

Support would be important to have proper dual display configurations.
(It is annoying to have two vertically placed displays with 1680 and
1280 vertical size virtually placed horizontally with the sizes of 1050
and 800, just to fit the maximum size of 2048 in both dimensions.

-- 
intel xorg driver disables direct rendering for virtual display larger than 2048
https://bugs.launchpad.net/bugs/164049
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