VMD-L Mailing List

From: Vlad Cojocaru (vlad.cojocaru_at_mpi-muenster.mpg.de)
Date: Thu Jan 21 2016 - 03:02:49 CST

Actually according to some info I found, the newer NVIDIA driver should
actually provide support for Quad Buffered Stereo and Composite together
.. Apparently, the problem may actually be with the Desktops (Compositor)

Some reads about this (it may be a topic that will come more often as
people switch to newer desktops
..
https://github.com/chjj/compton/issues/270
https://devtalk.nvidia.com/default/topic/795180/proplems-with-stereo-unde-k4200-in-linux/
https://bugs.kde.org/show_bug.cgi?id=335859

Best
Vlad

On 01/20/2016 11:00 PM, John Stone wrote:
> Hi,
> The use of stereo when the composite extension is on is prohibited
> by the underlying video driver, VMD is just reporting what the driver says
> when VMD asks for stereo.... The driver limitation (that the composite
> extension ends up disabling stereo) is documented in the NVIDIA driver
> READMEs, and the latest drivers provide a simple command line flag for
> nvidia-xconfig to disable or enable the composite extension:
> http://http.download.nvidia.com/XFree86/Linux-x86/361.18/README/xcompositeextension.html
>
> Here is the key text from the NVIDIA README:
> "Workstation overlays, stereo visuals, and the unified back buffer (UBB)
> are incompatible with Composite. These features will be automatically
> disabled when Composite is detected."
>
> When you start the X11 server, you'll see warning messages
> about stereo being disabled in the X11 server logs, in /var/log/Xorg.0.log
>
> As far as I know there is no way around this. I'm not sure why KDE
> cannot be run without the composite extension, but if you care about
> using stereoscopic display modes, it might be time to switch from KDE to a
> different desktop manager.
>
> Cheers,
> John Stone
> vmd_at_ks.uiuc.edu
>
>
> On Wed, Jan 20, 2016 at 06:45:30PM +0100, Vlad Cojocaru wrote:
>> Dear VMD users, developers,
>>
>> I have installed the new openSUSE (Leap - 42.1) and I am able to run
>> neither KDE nor GNOME properly with "Composite" disabled. With
>> "Composite" enabled I am not able to use stereoscopic viewing in VMD
>> with NVIDIA 3D vision. Does anyone know if there is any way to make VMD
>> display stereo with the "Composite" extension enabled ? On my previous
>> openSUSE 13.2, KDE was running properly with "Composite" disabled, so I
>> was able to use stereo (Quad Buffered)
>>
>> I have the following setup:
>> x86_64 arch
>> VMD 1.9.2 (compiled from source)
>> NVIDIA driver 358.16
>> CUDA 7.5.18
>> OPTIX 3.9.0
>> NVIDIA 3D Vision
>> Graphics card: Quadro K4000
>>
>> Thanks for any advice
>>
>> Best wishes
>> Vlad
>>
>> --
>> Dr. Vlad Cojocaru
>> Computational Structural Biology Laboratory
>> Department of Cell and Developmental Biology
>> Max Planck Institute for Molecular Biomedicine
>> Röntgenstrasse 20, 48149 Münster, Germany
>> Tel: +49-251-70365-324; Fax: +49-251-70365-399
>> Email: vlad.cojocaru[at]mpi-muenster.mpg.de
>> http://www.mpi-muenster.mpg.de/43241/cojocaru 

-- 
Dr. Vlad Cojocaru
Computational Structural Biology Laboratory
Department of Cell and Developmental Biology
Max Planck Institute for Molecular Biomedicine
Röntgenstrasse 20, 48149 Münster, Germany
Tel: +49-251-70365-324; Fax: +49-251-70365-399
Email: vlad.cojocaru[at]mpi-muenster.mpg.de
http://www.mpi-muenster.mpg.de/43241/cojocaru