Graphics Administration Guide (October 2009)

The X*screens file is used to specify:
• Device-independent server options, and
• For each screen:
— what device file to use (required),
— the default visual,
— monitor size, and
— device-dependent screen options.
Note that all of the items above, except for device-independent server options, are specified on
a per-screen basis.
The X Server supports up to four screens at a time. Specifying more than four screens will cause
a server error message.
syntax guidelines
• Blank lines and comments (text following “#”) are ignored. Entries can occupy more than a
single line.
• All symbols in the file are recognized case-insensitive.
the X*screens file format
Items must appear in the X*screens file in the order that they are specified below.
[ServerOptions
<server_option>
.
.
.
<server_option>]
{Screen <device_name>} ||
{SingleLogicalScreen <nRows> <nCols>
<device_name1> . . .<device_nameN>}
[DefaultVisual
[Class <visual_class>]
[Depth <depth>]
[Layer <layer>]
[Transparent]]
[MonitorSize <diagonal_length><units>]
[MinimumMonitorPowerSaveLevel <level>]
[ScreenOptions
<screen_option>
.
.
. <screen_option>]
Brackets (“[“and “]”) denote optional items. Italicized items in angle brackets (“<” and “>”)
denote values to be specified. The double vertical line (“||”) denotes that one of the ored values
(items surrounded by braces, “{“and “}”) must be included.
The block from the “Screen <device_name>” line to the final “<screen_option>” line is referred
to as a either a “Screen Entry” or as a “Single Logical Screen entry”. As shown above, the X*screens
format is composed of an optional block specifying device-independent server options followed
by one or more either Screen or Single Logical Screen entries (maximum of four graphics
devices).The minimum X*screens file is a line with the keyword “Screen” followed by a screen
device file. For example: Screen /dev/crt
server options
For more information about server options, or about additional server options, look in an
information file (for example, /usr/lib/X11/Xserver/info/screens/hp).
GraphicsSharedMemorySize <memory_size>
X Server configuration 33