VMD-L Mailing List

From: Clarinet (clarinet_at_atlas.cz)
Date: Mon Sep 16 2013 - 09:40:08 CDT

Hi all,

We have two servers with VMD installed and several workstations that
call it remotely, i.e. users start VMD on the server and let it open
windows on their workstation using X11 redirection via ssh tunnel.

For most combinations of servers and workstations everything is fine,
but there are certain pairs that do not allow VMD to start saying:

Info) VMD for LINUXAMD64, version 1.9.1 (February 1, 2012)
Info) http://www.ks.uiuc.edu/Research/vmd/
Info) Email questions and bug reports to vmd_at_ks.uiuc.edu
Info) Please include this reference in published work using VMD:
Info) Humphrey, W., Dalke, A. and Schulten, K., `VMD - Visual
Info) Molecular Dynamics', J. Molec. Graphics 1996, 14.1, 33-38.
Info) -------------------------------------------------------------
Info) Multithreading available, 4 CPUs detected.
Info) Free system memory: 11154MB (92%)
Warning) Detected a mismatch between CUDA runtime and GPU driver
Warning) Check to make sure that GPU drivers are up to date.
Info) No CUDA accelerator devices available.
Warning) Detected X11 'Composite' extension: if incorrect display occurs
Warning) try disabling this optional X server feature.
ERROR) A TrueColor visual is required, but not available.
ERROR) The X server is not capable of displaying double-buffered,
ERROR) RGB images with a Z buffer. Exiting ...
Info) VMD for LINUXAMD64, version 1.9.1 (February 1, 2012)
Info) Unable to create OpenGL window.

So workstation A is able to run VMD from server X as well as Y, but
workstation B can only run VMD from server X, running VMD form Y fails
with the above message. Both installations of VMD (on servers X and Y)
are identical (version 1.9.1).

What can be the problem? Can it be somehow connected to the issue we
have been discussing some time ago
http://www.ks.uiuc.edu/Research/vmd/mailing_list/vmd-l/21153.html ? Some
of the workstations that have the current problem also suffered from the
previous one, but we cannot confirm that it is a general rule.

Best regards,

Jiri Polach