It looks like the server insists on using the LVDS for initial setup.
It would be great if you can file a bug upstream, bugs.freedesktop.org.
In addition to removing the "1920" mode, you can also reduce the Virtual
(horizontal) size to 1920+1280 or even 1280+1280, not that it should
normally matter.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Assignee: Tormod Volden (tormodvolden) => (unassigned)
Status: Incomplete => Confirmed
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Dual-head fails with ati driver, appears related to 'crtc'
https://bugs.launchpad.net/bugs/172601
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