This issue apparently has been fixed with the latest update.
Compiz is now already replaced by metacity with a resolution width of 2048 px
in total.
compiz --replace
compiz (core) - Warn: Exceeded max texture size
Launching fallback window manager
** Changed in: linux (Ubuntu)
Status: Triaged => Fix Released
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[i945gm] dual screen not working with virtual resolution enabled: just a blank
screen with a mouse pointer
https://bugs.launchpad.net/bugs/383345
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