From: Axel Kohlmeyer (akohlmey_at_gmail.com)
Date: Mon Aug 29 2011 - 10:37:24 CDT

On Mon, 2011-08-29 at 10:28 -0400, Dave Schall wrote:

hi dave,

> I am running ubuntu 10.04 with a quadro 4000 gpu, nvidia's 3d vision
> glasses, and an acer GD235hz monitor. The gpu and emitter are synced
> via the 3 pin connector as directed. Through many trials and
> tribulations (and many edits to my xorg.conf file), I got 3d viz to
> work, ... sort of. Approximately every 2 seconds the image jumps on
> the screen. It is visible with and with out the glasses. It happens
> both in VMD and when running glxgears -stereo. It must be a setting
> somewhere but I can't find any info anywhere describing a fix for the
> problem. Any VMD users have any tips?

so i guess you have set the stereo mode in xorg.conf to 10, right?

>
> The only clue I have is that the refresh rate in the xorg.conf file is
> set to 120 hz, while the actual refresh in the nvidia setup tool is
> listed as 99.something. I wonder if the combination of refresh rate
> and resolution 1920x1080 isn't allowed for some reason. It should be
> according to the monitor specs.

what does xrandr say about the refresh rate?

also, have a look at the output in /var/log/Xorg.0.log
there is usually a log entry if something that is configured
doesn't work, or some setting skipped. in fact, most of the
time there is too much output, so it may be hard to find the
one setting that you need.

whether the screen's spec support it or not, is usually
not relevant, but rather whether its EDID setting allows
this. those may be in error or set up more conservative
than what the documentation says.

there are different ways to work around "wrong" EDID settings
(which xorg drivers will by default prefer over any user settings),
one example is referenced here (in order to fake the presence of
a screen entirely).
http://sites.google.com/site/akohlmey/random-hacks/nvidia-gpu-coolness

cheers,
   axel.

>
> Thanks for the help,
>
> Dave
>
> --
> J. David Schall, Assistant Professor
> Dept. of Mechanical Engineering, Oakland University
> 130 DHE, Rochester, MI 48309
> 248-370-2870

-- 
Dr. Axel Kohlmeyer
akohlmey_at_gmail.com http://goo.gl/1wk0
Institute for Computational Molecular Science
Temple University, Philadelphia PA, USA.