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Note: DHA (Direct Hardware Access) is not supported in a window that spans multiple screens. This
means, for example, that while graphics is supported to a window spanning two or more screens,
accelerated graphics is not. "Spanning," in this context, includes a window that is two or more screens in
size, as well as a window that is partially on one screen and partially on another (even though it would
fit on a single screen if it were moved).
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SLS can also be enabled via the /etc/X11/X*screens file via the syntax:
SingleLogicalScreen n m
/dev/crt0 ... /dev/crtk
where:
n = the number of "rows" in the physical configuration
m = the number of "columns" in the physical configuration, and the product of nXm is less than
or equal to four.
For example, to create a logical screen that is one monitor tall by two monitors wide, the following
syntax would be used:
SingleLogicalScreen 1 2
/dev/crt0 /dev/crt1
Whereas for a logical screen that is two monitors tall by one monitor wide, the syntax is:
SingleLogicalScreen 2 1
/dev/crt0 /dev/crt1
3D Acceleration and Single Logical Screen
Currently, SLS does not take advantage of 3D acceleration (e.g. CRX-24Z). 3D applications (from any
supported HP 3D API) will continue to run with SLS; However, 3D performance with SLS will be much
slower than it is without SLS.
HP VUE/CDE and Single Logical Screen
Be sure that HP VUE/CDE has not been modified to take advantage of the Single Logical Screen
capability. When presenting information on your display, HP VUE may split a window across physical
screens. Examples include:
• The login screen.
• The Front Panel.
• Window move and resize boxes.
• The screen lock dialog.
Graphics Administration Guide for HP-UX 10.20
Page 47