You have been subscribed to a public bug:
Vsync is lost and significant tearing occurs after removing a monitor.
Tested with compiz 0.9.9 revision 3521 on radeon.
Test case:
1. Start with one monitor. Verify no tearing occurs when moving windows.
2. Enable two monitors in the Displays dialog. Verify no tearing occurs on
either monitor.
3. Disable (turn off) one monitor in the Display dialog so you're left with
only one again.
Expected: No tearing occurs when moving windows.
Observed: Tearing occurs and won't go away until compiz is restarted.
** Affects: compiz (Ubuntu)
Importance: Medium
Status: Invalid
** Affects: xserver-xorg-video-ati (Ubuntu)
Importance: Undecided
Status: New
** Tags: tearing
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[radeon] vsync is lost after removing a monitor, resulting in tearing
https://bugs.launchpad.net/bugs/1088782
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