VMD-L Mailing List

From: Michael Redmond (redmond_at_engr.wisc.edu)
Date: Tue Apr 22 2003 - 17:15:22 CDT

Marc and John,

We just got our Stereo VMD working with Linux and Quadro 750XGL card. It is
basically functional, but I am seeing the same types of problems I saw
under Windows when using shutter glasses. It is very infrequent, but there
will be an occasional "glitch" where both lenses of the glasses go clear
for a frame (or maybe a few). I haven't detected the image shearing that is
obvious with some Quadro cards (particularly the 550XGL) on Windows since
the glitches are infrequent. On Windows, we end up correcting the problem
with an odd resync utility that EDimensional has available on their web
site. There is no equivalent for Linux and I am not sure what it does,
though I expect it syncs the glasses to monitor refresh somehow.

Basically, this version works (1.8.1b2), so thanks Johns...we still need to
get lots of other driver problems fixed with NVidia some day (maybe)...

Mike Redmond
UW-Madison eMedia Center 

---
At 10:03 AM 4/15/2003 +0200, Marc Baaden wrote:
>Hi,
>
>since recently we have a workstation with a stereo capable nvidia graphics
>card (Quadro4 900 XGL) and shutter glasses. As there were some 
>particularities
>about setting this up properly, I thought I share the important things.
>BTW, this is mainly based on advice from Andy Ritger (nvidia) and John Stone.
>
>- there are some performance/stability problems, in particular with dual
>   athlons. Make sure to upgrade to the *very* latest nvidia drivers (>=4349)
>
>- if you have flickering problems, note that default video modes are quite
>   bad for stereo. Ideally you'd like 120 Hz vertical refresh. We now use the
>   following modes, which significantly reduce flickering (NB: make sure your
>   monitor supports those ! *no warranty*)
>
>   # 1600x1200 @ 111.00 Hz (GTF) hsync: 141.97 kHz; pclk: 315.74 MHz
>     Modeline "1600x1200_111"  315.74  1600 1736 1912 2224  1200 1201 1204 
> 1279  -HSync +Vsync
>   # 1280x1024 @ 120.00 Hz (GTF) hsync: 131.64 kHz; pclk: 233.79 MHz
>     Modeline "1280x1024_120"  233.79  1280 1384 1528 1776  1024 1025 1028 
> 1097  -HSync +Vsync
>   # 1024x768 @ 120.00 Hz (GTF) hsync: 98.76 kHz; pclk: 139.05 MHz
>     Modeline "1024x768_120"  139.05  1024 1104 1216 1408  768 769 772 
> 823  -HSync +Vsync
>
>- to workaround performance drops in monoscopic display, use stereo with
>   zero eyesep in that case (has already been mentioned on this list 
> previously)
>
>- the antialiasing related environment variable  __GL_FSAA_MODE is 
>incompatible
>   with the stereo mode. Make sure you don't set it, or your display will be
>   very bizarre.
>
>- last but not least, if you can afford it, it seems that the Quadro FX series
>   has fewer stereo related quirks (but it costs about double :)) ..
>
>Cheers,
>   Marc Baaden
>
>--
>  Dr. Marc Baaden  - Institut de Biologie Physico-Chimique, Paris
>  mailto:baaden_at_smplinux.de      -      http://www.marc-baaden.de
>  FAX: +49 697912 39550  -  Tel: +33 15841 5176 ou +33 609 843217