I'm pretty sure I have discovered the cause of the bug and a fix. The
patch is in the upstream bugzilla, and I am currently testing it.
The bug is in xorg-server rather than in the ATI driver.
** Also affects: xorg-server (Ubuntu)
Importance: Undecided
Status: Unconfirmed
** Changed in: xorg-server (Ubuntu)
Status: Unconfirmed => Confirmed
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RandR stops working with MergedFB when the external display is disconnected
https://launchpad.net/bugs/37444
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