From: John Stone (
Date: Wed Dec 03 2014 - 15:30:09 CST

  That is very helpful to know, in case anyone else runs into similar
issues in the future. It would seem that the unusual part of your
system is the 'optimus' driver. I have to admit that up to now
I've never run Linux on a laptop or desktop that used the optimus type
configuration, so none of those errors you were getting were familiar to me.
Thanks for summarizing to VMD-L about your solution.

  John Stone

On Wed, Dec 03, 2014 at 10:24:52PM +0100, Albert wrote:
> Hi John:
> Thanks a lot for the advices.
> I reinstalled my blumbee and optimus driver for nvidia. It works fine
> now. It seems that my udpate library break blumbee and optimus.
> best
> Albert
> On 12/03/2014 10:11 PM, John Stone wrote:
> >Hi,
> > The VMD output you have included below seems to indicate that
> >you're trying to run VMD using VirtualGL. The CUDA error indicates
> >that you're running VMD on a machine that has a very out-of-date
> >NVIDIA driver of some kind. You can check what the driver version is
> >like this:
> > cat /proc/driver/nvidia/version
> >
> >The next warning about the "Composite" extension is non-fatal, but
> >indicates that the X-windows configuration has the composite extension
> >turned on, and generally I would recommend that it be disabled because
> >it has a bad track history of interfering with stereoscopic display
> >and other advanced OpenGL features.
> >
> >The final errors are the ones that are more serious. These errors appear
> >to be VirtualGL errors and they are complaining about being unable to load
> >an OpenGL software rasterization driver of some kind "swrast". It seems
> >that your system may have a set of mismatched OpenGL drivers being used by
> >VirtualGL and VMD, and that this is causing problems.
> >
> >Can you comment further about how you are running VMD on this system?
> >All of those "VGL" messages you see are not part of VMD, they must have
> >to do with your particular host machine and its windowing system, and
> >I'm guessing they are related to VirtualGL.

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