Public bug reported:
Binary package hint: gnome-control-center
I have observed the problem when using my laptop (Compaq NC6220) with an
external monitor or projector. It can be reproduced as follows:
1. Start with both screens in mirrored (clone) mode, and with no virtual
resolution line in xorg.conf.
2. Open the screen resolution capplet.
3. Uncheck the "mirror screens" box. The screens are still displayed as a
single one, that is, you still see only one of them even if they aren't in
mirror mode anymore. This is confusing.
4. Click on the visible screen. This will move it under the other one, which
should have happened in step 3, anyway.
5. Check the "mirror screens" box again. The screens come together again.
Notice that this state should be exactly equivalent to the initial state,
before opening the box.
6. Press the apply button. A message box appears stating that the virtual
resolution must be changed, which is obviously not true since we didn't change
anything. Accepting the dialog actually inserts some bogus "Virtual" line in
xorg.conf.
This happened when using the capplet under intrepid beta (gnome-control-
center 2.24.0.1).
** Affects: gnome-control-center (Ubuntu)
Importance: Undecided
Status: New
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Screen resolution capplet unnecesarily tries to set virtual resolution
https://bugs.launchpad.net/bugs/287062
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