[vox-tech] Multiple displays and graphics cards

[Mark K. Kim]

On Wed, Jan 24, 2007 at 09:02:35PM -0800, John Wojnaroski wrote:
> castle at turret:~$ export DISPLAY=:0.1
> castle at turret:~$ xclock &
> [1] 1580
> castle at turret:~$ Xlib: connection to ":0.1" refused by server
> Xlib: Invalid MIT-MAGIC-COOKIE-1 key
> Error: Can't open display: :0.1

Okay.  Let's go back to the ssh session, except when you ssh to the
remote system, check the DISPLAY setting.  It's probably:

   $ echo $DISPLAY
   <ip>:10.0

Change 10.0 to 10.1, 10.2, and 10.3 for the other 3 displays:

  export DISPLAY=<ip>:10.0
  xterm &
  export DISPLAY=<ip>:10.1
  xterm &
  export DISPLAY=<ip>:10.2
  xterm &
  export DISPLAY=<ip>:10.3
  xterm &

or, simply:

  xterm -display <ip>:10.0 &
  xterm -display <ip>:10.1 &
  xterm -display <ip>:10.2 &
  xterm -display <ip>:10.3 &

If you don't see <ip>:10.0 when you do $DISPLAY, X forwarding probably
isn't setup.  That's another issue:

  - Make sure "X11Forwarding yes" is in /etc/ssh/sshd_config on the
    remote system.

  - When logging into the remote system, try running ssh with the -X
    option.

-Mark