From: Axel Kohlmeyer (
Date: Tue Nov 01 2011 - 19:08:07 CDT

On Tue, Nov 1, 2011 at 8:03 PM, Tristan Croll <> wrote:
> Hi Axel,
> Yes, it was completely unexpected to us as well.  It only came to light when he ran VMD remotely off my machine using his laptop, and things magically started working.  To answer your specific question below, though, I tried that - downloaded vmd-1.9.1a12 off Biocore yesterday.  It didn't help.

no, that is not the version that i was talking about, there should be
a special (older) version that has the newer VRPN client, but this
is in a subdirectory. check this out:

ls /home/akohlmey/biocore/VMD\ \(Public\)/alpha/VRPN-ICMS



> Cheers,
> Tristan
> -----Original Message-----
> From: Axel Kohlmeyer []
> Sent: Tuesday, 1 November 2011 11:16 PM
> To: Tristan Croll
> Cc:
> Subject: Re: vmd-l: VRPN-ICMS conflict with NVidia driver
> hi tristan,
> On Tue, Nov 1, 2011 at 3:16 AM, Tristan Croll <> wrote:
>> Hi,
>> My local IT guru and I have just spent the better part of a day banging our
>> heads against a problem that has the same appearance as a previous one
>> mentioned in the VMD list (starting at
>>  We'd
> hmm... this problem has been tracked down to an incompatibility
> in the behavior of the (rather old) VRPN client code in VMD and
> the newer server code in VRPN-ICMS. so using a VMD binary
> linked against a newer VRPN library resolved that for real.
>> connected a Novint Falcon, used the demo program to confirm it was working
>> properly, and used the vrpn test programs to confirm that vrpn was
>> communicating OK.  Yet when we tried to connect through VMD, however, it
>> refused to connect, with error messages identical to those described in the
>> message I linked above.
>> Anyway, the problem was eventually (and rather bizarrely) solved by rolling
>> our NVidia drivers back from 285.05.09-285.05.09-139.el6.x86_64 to
>> 280.13-280.13-138.el6.x86_64.
> that is unusual and unexpected. i have no idea how this would
> correlate to the connection issues, but thanks for letting us know.
>> Thought it was worth a mention, for weirdness if nothing else.
> since you spent already some time on this, would you mind
> doing one more test? and use the contributed alpha test
> binaries of VMD that include the new VRPN client code?
> those should allow you to work with the newer nvidia drivers.
> thanks,
>    axel.
>> Cheers,
>> Tristan
> --
> Dr. Axel Kohlmeyer
> College of Science and Technology
> Temple University, Philadelphia PA, USA.

Dr. Axel Kohlmeyer
College of Science and Technology
Temple University, Philadelphia PA, USA.