The presentation operator can preview the next slide to be displayed using
the Impress slide pane without disturbing the projected image.
To configure this operation, set the resolution of the two screens, and then offset the
projector within the control screen. In this ServerLayout section, I placed the projector
screen 200 pixels below and to the right of the upper-left corner of the control
screen:
Section "ServerLayout"
Identifier "layout0"
Figure 4-3. Overlapping Xinerama layouts
A. Overlapping B. Two resolutions, common origin
C. Subset D. Same image on two video cards
4.6
74 Chapter 4: Advanced X.org Configuration
Screen 0 "Screen0" 0 0
# Screen 1 is 200 pixels down and to the right
Screen 1 "Screen1" 200 200
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
This configuration assumes multiple video cards. However, some video cards with
multiple outputs??”including laptops??”can be configured for Xinerama operation
using driver-specific options.
It??™s possible to configure multi-screen mode with overlapping screens,
but I don??™t know of any situation where this would be useful.
4.6 Scrolling Virtual Screens and Xinerama
The virtual screen facility permits a screen to exceed the size of a physical display,
which results in a physical display that scrolls around the virtual screen.
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