Yes, a reasonable person might expect it
to work…but we have tried on both Mac and Linux, and it doesn’t
work with either CystalEyes or NuVision hardware. I don’t think
Modeline timings have any meaning when generating a true digital display signal,
but regardless, the actual sync signal output is not correct.
My naïve guess is that this is
because the analog sync signal from the Quadro DIN connector is based off of
the SVGA vertical blanking interval and has nothing to do with the digital-only
display signal required by these displays. Note that these displays do
not accept an analog SVGA signal – they have only a pure-digital DVI-D connector
– not DVI-I, and they have no HD15 SVGA input. They also require a full
dual link DVI-D cable with all pins present. It seems that the dual-link capacity
is used to carry the 120 Hz signal (perhaps split over two regions of the
display? or with the left 60Hz on one channel and the right 60Hz on the other?).
Furthermore, even if the Quadro sync was
correct, the polarization of the old shutter glasses conflicts with that of the
liquid crystal. I also observed that light from the Samsung LCD seems to
interfere with the old CrystalEyes sync signal. Of course, the other
problem is that affordable Quadro cards do not even come with a sync connector.
So in summary, there seem to be many
problems combining modern LCDs with old stereo 3D hardware, which presumably
explains in part why nVidia decided to introduce a new USB emitter and glasses
for use with these displays.
From: Davis, Malcolm
Sent: Friday, July 17, 2009 2:00
Subject: Re: [PyMOL] WARNING: No
Mac or Linux support for 120 HzLCD synchronization
Has anyone tried
these with the old CrystalEyes glasses? We are looking to get one of
these to try, but it is hard to understand why there should even be a need for
a different graphics driver or a newer Quadro card to use it that way.
The FX1100 cards we still have in some of our Linux workstations can be
configured to send a 1600x1200@100Hz signal to our old IBM c220p monitors and
the 100Hz limit was from the monitor not the graphics card. So other than
needing to specify the Modeline manually in the X config files, why shouldn't
this just work?
From: Warren DeLano
Sent: Friday, July 17, 2009 12:23
Subject: [PyMOL] WARNING: No Mac
or Linux support for 120 Hz LCD synchronization
Just to make sure everyone understands:
Stereo 3D support for these awesome new 120 Hz LCD displays
is WINDOWS ONLY due to the need of a special USB driver for the 3D Vision sync
emitter. Unfortunately, you cannot sync a digital 120 Hz LCD using the
old stereo analog DIN sync connector – it just doesn’t work.
Please do not waste money right now buying a 120 Hz LCD if
you use Linux or Mac OS (even if you have a Quadro card), or if you use a
Windows laptop (without a Quadro graphics chip). You will be disappointed
-- the display will not do 3D with your system, and nVidia has not promised
support for 120 Hz LCD synchronization on platforms other than Windows.
That may change, but then again, it might not.
Accordingly, our recommended stereo 3D solution for Mac,
Linux, and for Windows systems without Quadro cards is the Zalman M220W LCD
display. You get fewer pixels for stereo 3D, but it works great with
PyMOL on ALL PLATFORMS (including most laptops). No special graphics hardware
or drivers are required to use the Zalman with PyMOL. http://pymol.org/zalman
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