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Old 04-28-10, 11:57 AM   #1
tytoalba
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Join Date: Apr 2010
Posts: 3
Default How to get >60hz refresh? Karmic + Quadro FX570 + Viewsonic VX2265wm

I've got a Quadro FX570 card driving a 1680x1050_120hz capable
Viewsonic VX2265wm LCD flat panel. I've spent days trying to
figure out how to actually get anything >60hz referesh
rates out of this config.

I've tried everything I can find in the forums and on the
web:
- using nvidia-settings (as root) to disable GPU scalling
and set 1680x150, 120 hz in the panel etc
- manually tweaking xorg.conf, numerous options and modelines
etc
- xrandr -rate 120 (tweaking xorg.conf is required to get this
to work), this makes the reported rate 120hz, but the actual
rate still 60..

Bottom line is the server validates the 1680x1050_120 and
1680x1050_110 etc (bug report attached) modes and *should* (as far as
I can tell) be using them, but the actual refresh rate is always 60hz.
I've verified the rate using software (glxgears, my own program and
even scoping a photodiode attached to the screen).

Any suggestions here? I feel like I must be missing something incredibly
obvious here -- particularly since there don't seem to be a lot of people
in the same boat based on searching the web. Is anyone else trying to
drive a 120hz lcd (not for stereo) with the nvidia supplied drivers under
linux?

Thanks,
/jamie
Attached Files
File Type: gz nvidia-bug-report.log.gz (32.9 KB, 70 views)
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Old 04-29-10, 11:40 AM   #2
tytoalba
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Join Date: Apr 2010
Posts: 3
Default Re: How to get >60hz refresh? Karmic + Quadro FX570 + Viewsonic VX2265wm

Hate to be the only person to follow-up on my own posting... but after more poking around and more seriously considering this is an issue with the Viewsonic monitor, I'm now starting to realize I might have misunderstood something about the monitor... It looks like the only way to get 120hz is to feed two DVI signals in through a dual DVI plug. With a regular DVI cable (and one driving signal from the card) the monitor only goes to 60hz and simply does frame doubling to match the 120hz internal refresh rate.

Can anyone in the know confirm this is the case? If I'm not interested in stereo, I'm wondering if I can set my card into clone mode so both DVI connectors are putting out
the same video signal and then merge them with a dual-DVI cable and really get up
to 120hz?? Anyone tried something like this?

/jamie
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Old 04-29-10, 12:08 PM   #3
sfer
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Join Date: Sep 2006
Posts: 35
Default Re: How to get >60hz refresh? Karmic + Quadro FX570 + Viewsonic VX2265wm

It doesn't work like that. 120 Hz monitors take just one dual-link DVI input. Dual-link simply means that there are more pins on the connectors. You also need a cable that has all the necessary pins. Take at look at this for a picture of different DVI connectors.

If you manage to get 120 Hz working, please tell how you managed to do it. I've been looking at getting such a monitor myself to replace my ancient CRT.
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Old 05-01-10, 10:55 AM   #4
tytoalba
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Posts: 3
Default Re: How to get >60hz refresh? Karmic + Quadro FX570 + Viewsonic VX2265wm

Bingo -- that was exactly it. I swapped the regular DVI cable for a dual-link DVI cable and changed the refresh rate to 120hz using nvidia-settings and voila, 120hz.. clear as mud. Easy to setup, but far from obvious that a higher bandwidth cable's required...
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