XDPYINFO(1)

NAME
       xdpyinfo - display information utility for X

SYNOPSIS
       xdpyinfo  [-display  displayname] [-queryExtensions] [-ext
       extension-name]

DESCRIPTION
       Xdpyinfo is a utility for displaying information about  an
       X  server.   It  is  used to examine the capabilities of a
       server, the predefined values for various parameters  used
       in  communicating  between clients and the server, and the
       different types of screens and visuals that are available.

       By  default, numeric information (opcode, base event, base
       error) about protocol extensions is not  displayed.   This
       information  can  be  obtained  with  the -queryExtensions
       option.  Use of this option on  servers  that  dynamically
       load  extensions will likely cause all possible extensions
       to be loaded, which can be slow and can  consume  signifi-
       cant server resources.

       Detailed  information about a particular extension is dis-
       played with the -ext extensionName option.  If  extension-
       Name is all, information about all extensions supported by
       both xdpyinfo and the server is displayed.

ENVIRONMENT
       DISPLAY To get  the  default  host,  display  number,  and
               screen.

SEE ALSO
       X(1) xwininfo(1) xprop(1) xrdb(1) 

AUTHOR
       Jim Fulton, MIT X Consortium
       Support  for  the  XFree86-VidModeExtension,  XFree86-DGA,
       XFree86-Misc, and XKB extensions added by Joe Moss