Public bug reported:
Binary package hint: xorg
On a secondary X screen (:0.1) which has different (larger) dimensions
than the primary(:0.0), the lower part of the secondary screen is
ignored by the display manager, remaining black and not displaying
windows in that area, although the mouse does display in that area.
There appears to be a relationship between the issue and the primary
screen in that it appears that the height of the primary screen is being
used as the height of the secondary screen - the black area looks to be
1024-800=224 pixels.
Not entirely sure if this bug is Xorg or elsewhere. Because it relates
to running multiple X screens it is testable only with the nvidia
driver. However, this is a regression from Hardy/Intrepid in that the
same configuration on those worked fine.
A picture speaks a thousand words and in this case that is very true.
Attached are two photographs that demonstrate the issue.
The system has the laptop DFP (1280x800) to the left of an analogue TFT
(1280x1024). nvidia-settings was used to position the screens relatively
so the mouse moves between them.
Photograph #1 shows the overview. The secondary screen on the right
shows a large black band on the lower section of the display where
windows cannot go. You can see that even the desktop background picture
doesn't get rendered into that area.
Photograph #2 focuses on the secondary screen. It shows the nvidia-
settings dialog which is displaying the screen position dialog. If you
look closely you'll see that the entire bottom section of the dialog
window has been cropped by the black area, even though the mouse cursor
is able to move in that area.
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
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Outof-bounds areas for multiple X screens with different dimensions
https://bugs.launchpad.net/bugs/331918
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