xdpyinfo - display information utility for X

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

X Version 11                                     xdpyinfo 1.3.4                                      XDPYINFO(1)

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 significant server resources.

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

       If -version is specified, xdpyinfo prints its version and exits, without contacting the X server.

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

       xdpyinfo - display information utility for X

X(7), xprop(1), xrdb(1), xwininfo(1), xrandr(1), xdriinfo(1), xvinfo(1), glxinfo(1)

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