When using a multi-screen configuration, each screen stands on its own, and the
only relationship between the screens is that one window manager, mouse, and keyboard
is used with all three. But when using Xinerama, the hardware screens are
merged into one logical Xinerama screen; a single, rectangular Xinerama screen is
created that is large enough to contain all of the areas displayed the hardware
screens.
If the monitors are different sizes, then there will be portions of this rectangle that
are inaccessible??”part of the Xinerama screen, but not part of any hardware screen,
as shown in Figure 4-1.
Since these areas will not be displayed on any monitor, it is possible to temporarily
lose your mouse pointer (or entire windows) in them. You can??™t do that on a multiscreen
configuration, because multi-screen mode doesn??™t have inaccessible areas??”
the mouse pointer position is warped so that it??™s always visible on one of the screens.
The behavior of window managers and desktops also varies significantly between the
Xinerama and multi-screen modes, as shown in Table 4-1.
4.3
70 Chapter 4: Advanced X.org Configuration
Figure 4-1. Inaccessible areas in a Xinerama screen
Table 4-1.
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