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Old 02-02-06, 04:05 PM   #1
XXeR_
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Default 1920x1200 on Sony 23"

Hello, I am unable to get 1920x1200 on a Sony 23" LCD monitor (Model # SDM-P234/B). I am using an Nvidia Quadro FX 1100 in an AMD based Sun Workstation, running RHEL3 U6.

I ran X using "startx -- -logverbose 5" and generated the attached nvidia-bug-report.log.

Can someone please help me generate the appropriate modeline for this setup?

Thanks!
Attached Files
File Type: txt sony23_1100_nvidia_bug_report.txt (79.1 KB, 174 views)
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Old 02-02-06, 04:12 PM   #2
netllama
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Default Re: 1920x1200 on Sony 23"

This problem should be resolved in 1.0-8178. Please provide a new bug report if it is not.

Thanks,
Lonni
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Old 02-02-06, 04:15 PM   #3
XXeR_
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Default Re: 1920x1200 on Sony 23"

i'll try it out, thanks!
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Old 02-03-06, 11:10 AM   #4
XXeR_
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Default Re: 1920x1200 on Sony 23"

Lonni, unfortunately the problem is still there. Attached is a bug report from the new driver. Thanks for helping me out!
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File Type: txt new_driver-nvidia-bug-report.txt (95.6 KB, 191 views)
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Old 02-03-06, 11:44 AM   #5
netllama
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Default Re: 1920x1200 on Sony 23"

What you're attempting is not possible due to the hardware that you're using. It has a maximum pixelclock of 135Mhz:
(--) NVIDIA(0): DFP-0: maximum pixel clock: 135 MHz

Yet the EDID in your display requires an 154Mhz pixelclock for 1920x1200:
(--) NVIDIA(0): Pixel Clock : 154.00 MHz

You'll need to use a videocard with a higher max pixelclock.

Thanks,
Lonni
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Old 02-03-06, 11:49 AM   #6
XXeR_
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Default Re: 1920x1200 on Sony 23"

darn. too bad. well, thanks for the info!
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Old 02-04-06, 01:21 AM   #7
Mats
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Default Re: 1920x1200 on Sony 23"

You might want to try an interlaced modeline before looking for a new video card. Works great on Dell 2405FPW/Quadro NVS 280 AGP, even though it has the 135MHz DVI pixelclock limitation. See my previous post in http://www.nvnews.net/vbulletin/show...t=61703&page=2.

Regards,
Mats
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Old 03-01-06, 07:59 PM   #8
Gumboot
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Default Re: Can't achieve high resolution DVI output

Quote:
Originally Posted by netllama
What you're attempting is not possible due to the hardware that you're using. It has a maximum pixelclock of 135Mhz:
(--) NVIDIA(0): DFP-0: maximum pixel clock: 135 MHz

Yet the EDID in your display requires an 154Mhz pixelclock for 1920x1200:
(--) NVIDIA(0): Pixel Clock : 154.00 MHz

You'll need to use a videocard with a higher max pixelclock.
I have precisely this problem as well, but I can confirm that 135MHz is not the true limit of the pixel clock. With the open-source driver the limit is declared to be 350MHz, and I've successfully used a 154MHz pixel clock to drive a DVI display. It's an artificial limit or misdetection introduced by the nVidia binary-only driver.

Normally I'd just go along with this, but the outcome is that the card fails to live up to the specifications that are printed on the box and that were advertised on the website.

I am using the interlace workaround and I have to admit that I can't actually see any visual artefacts that that should introduce, and the OSD still says it's 60Hz. It could be that the mode is disabled by software because the numbers don't work out, but once that stage has been worked around everything is renegotiated from scratch for DVI and the proper pixel clock is used anyway... or it could just be that I haven't found the right test case yet.

For reference, I decided to make a modeline that was as close as possible to the monitor's own suggestion, with only the essential changes:
Modeline "1920x1200i" 96.33 1920 1968 2000 2080 1200 1203 1209 1235 interlace
And I'm doing this on a Gainward FX5200 PCI Pro/660 somethingorother talking to a Dell 2405FPW.
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Old 03-02-06, 03:27 AM   #9
pe1chl
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Default Re: 1920x1200 on Sony 23"

For the Dell 2405FPW you can (contrary to the Dell manual) just lower the pixelclock and thus the vertical refresh rate, and it will still display 1920x1200 via DVI. Interlacing is not required.
Before I had my 6600GT card I used this as well. You need to use a modeline and turn EDID off. The vertical refresh will be 52Hz if I remember well. Of course there will be no flicker.

Modeline "1920x1200" 135.00 1920 1968 2000 2080 1200 1203 1209 1235
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Old 03-02-06, 04:32 AM   #10
Gumboot
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Default Re: 1920x1200 on Dell 24"

Quote:
Originally Posted by pe1chl
For the Dell 2405FPW you can (contrary to the Dell manual) just lower the pixelclock and thus the vertical refresh rate, and it will still display 1920x1200 via DVI. [...]

Modeline "1920x1200" 135.00 1920 1968 2000 2080 1200 1203 1209 1235
I tried that and the monitor rejected it. It brought up a "can't display this mode" box. I've tried fiddling with the timings trying to squeeze all the pixels into a 135MHz dotclock and getting a high enough refresh rate, but the best I ever got was where the message flickered on and off as (I assume) it wavered over whether or not it could possibly display the mode.

That does suggest that the configured timings really are used on the DVI port, and that my speculation that they were being ignored was incorrect. I should have known that when I wrote it.


I really do need the pixel clock limit in the driver raised to support the modes that the card is supposed to support.
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Old 03-02-06, 11:36 AM   #11
pe1chl
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Default Re: 1920x1200 on Dell 24"

Quote:
Originally Posted by Gumboot
I tried that and the monitor rejected it.
Interesting... well, I reconstructed the above modeline from information on my current system. Here is the actual modeline that I have used (which I retrieved from a backup):

Modeline "1920x1200" 135.00 1920 1968 2000 2080 1200 1203 1209 1235 -hsync -vsync

I was astonished that it worked, but there wasn't any problem at all. Of course, it may be that different versions of the 2405FPW are around (with different firmware).
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Old 03-04-06, 05:41 PM   #12
Gumboot
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Default Re: 1920x1200 on Dell 24"

Quote:
Originally Posted by pe1chl
I was astonished that it worked, but there wasn't any problem at all. Of course, it may be that different versions of the 2405FPW are around (with different firmware).
It turns out the monitor only gets upset when you do that on the DVI port. It puts up with much more on the VGA port. I can, for example, get 1680x1050 on the VGA port, and using exactly the same mode on the DVI port the monitor refuses (1680x1050 is of particular interest to me because xvideo scaling flakes out at 1920x1200 so it's difficult to get fullscreen video playback).

There's also a more appropriate pixel clock limitation on the VGA interface. I can do anything on that! I have the ultimate power! But it's analogue and crappy. *sigh*

What I really need to do is to get myself a proper video card and start poking different modes down the DVI socket and see what comes out. This is exceedingly annoying because the specifications of the card I bought are meant to do what I want. This shouldn't be difficult.
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