All of these drivers have some limitations; for example, the NVIDIA driver, when
Table 4-2. Differences between using multiple outputs from one video card and using Xinerama
mode on multiple cards
Multiple outputs on one video card Xinerama with multiple video cards
Mouse cursor Appears on both monitors if overlapping Appears on one monitor at a time
Configuration file One Screen section (with driverspecific
options in the Device section)
Two Screen sections
3D capabilities Available on both monitors (if supported
at all)
Dependent on the combination of cards
and drivers; many configurations will
not support all features on all cards.
4.7
78 Chapter 4: Advanced X.org Configuration
used on a laptop, will always configure an external monitor as primary (screen 0),
and the ATI drivers permit only general monitor positioning (you can specify that
one monitor is to the right of another, but you can??™t indicate a difference in their vertical
alignment).
xrandr 1.2 can reconfigure and add outputs on-the-fly, enabling full
Xinerama configuration while the server is running. This feature is not
yet supported by many of the drivers or desktop environments, but it
promises incredible flexibility??”for example, new monitors could
automatically work as soon as they are plugged in.
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