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Old 06-21-05, 04:36 PM   #37
kulick
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Default Re: 7664 and 1600x1200 (maximum pixel clock?)

arokh,

Respectfully, I don't think so. Notice that in the first case (7174) the log says CRT-0, but in the second case (7664) the log says DFP-0. As I mentioned before, most cards have a RAMDAC (the CRT output circuitry) that runs a lot faster than the TMDS signaller (the DFP/DVI output circuitry). The real difference is that the 7174 driver didn't correctly use the TMDS timing limits when connecting via DVI. I wouldn't be so sure that this is a bug.

An nVidia rep did comment that the driver doesn't properly account for reduced sync timings in an earlier post in this thread. Personally, I think it does the "right thing" since it will work if you define a reduced sync timing modeline. Ideally, the X server and driver would realize somehow that it should use some predefined reduced sync timing modes when connected to a DFP though.

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Old 06-21-05, 05:41 PM   #38
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Default Re: 7664 and 1600x1200 (maximum pixel clock?)

That's a very good point. I actually made the switch to DVI right before installing 7664
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Old 06-21-05, 05:53 PM   #39
kulick
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Default Re: 7664 and 1600x1200 (maximum pixel clock?)

You might be able to get your setup to work with DVI and 7664 if you design a modeline that is 1600x1200 and still <155MHz. Assuming your monitor will sync to it, that is. You might want to give it a shot.

By the by, which card do you have that reports 155MHz with 7664? (I'm trying to confirm that the numbers are indeed a function of the card model...)

I have FX5700 Ultra -> 150MHz.

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Old 06-21-05, 07:44 PM   #40
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Default Re: 7664 and 1600x1200 (maximum pixel clock?)

I have an FX5200 connected to a Dell 2001FP, which with 7664 reports a maximum pixel clock of 135 MHz.

This Modeline works nicely for me:

Modeline "1600x1200" 130.25 1600 1648 1680 1760 1200 1203 1207 1235
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Old 06-22-05, 02:23 AM   #41
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Default Re: 7664 and 1600x1200 (maximum pixel clock?)

Yeah I got no problem getting it working. Used this modeline from earlier in this thread:

ModeLine "1600x1200" 155.0 1600 1704 1872 2128 1200 1201 1204 1222 +hsync +vsync
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Old 06-22-05, 05:06 AM   #42
kulick
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Default Re: 7664 and 1600x1200 (maximum pixel clock?)

Glad to hear that you guys are getting things working at least!

To get 1920x1200 on my setup, I'm running analog under Windows and the old driver to get DVI under FC4. This shouldn't be so hard to get working...

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Old 06-22-05, 07:47 AM   #43
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Default Re: 7664 and 1600x1200 (maximum pixel clock?)

From my understanding a single-link DVI should be able to do 165MHz, and the 6600GT card that I got should be able to deliver the same. However, I as many others get 155MHz reported in the log. My main question though is would changing to a dual-link cable (which should do 2x165MHz) work? Have anyone tried this?
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Old 06-22-05, 12:59 PM   #44
kulick
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Default Re: 7664 and 1600x1200 (maximum pixel clock?)

I believe this depends upon your graphics card. Some cards don't have the two TMDS signallers that are needed to drive Dual Link DVI. Additionally, some monitors don't support it. I think that my 24" LCD doesn't, for example. Mine requires a Single Link DVI carrying a reduced sync timing mode to achieve 1920x1200.

On the positive side, I think that you should be able to get your card to drive either 1600x1200 or 1920x1200 using a reduced sync timing. We are talking about Linux right? If so, look in your Xorg.0.log or XFree86.0.log file (in /var/log most probably). It should have some lines like this...
(II) NVIDIA(0): Supported additional Video Mode:
(II) NVIDIA(0): clock: 154.0 MHz Image Size: 518 x 324 mm
(II) NVIDIA(0): h_active: 1920 h_sync: 1968 h_sync_end 2000 h_blank_end 2080 h
(II) NVIDIA(0): v_active: 1200 v_sync: 1203 v_sync_end 1209 v_blanking: 1235 v
(II) NVIDIA(0): Ranges: V min: 55 V max: 75 Hz, H min: 30 H max: 80 kHz, PixCl
This is telling me the exact preferred mode of my monitor. You can use the similar numbers from your log to try out a custom modeline that would probably work for you. Translating the numbers above, you would get the following in your xorg.conf...
modeline 154.00 1920 1968 2000 2080 1200 1203 1209 1235
If you are having difficulty interpreting your logs, post them here and I (and others I'm sure!) can try to help...

If, on the other hand, you are doing Windows....well, good luck! I'm trying to figure that one out myself...

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Old 06-23-05, 09:58 AM   #45
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Default Re: 7664 and 1600x1200 (maximum pixel clock?)

The modeline shown in davemoore's entry worked here for me under 7664. However, where does one find the output that kulick is showing starting with (II) NVIDIA(0): Supported additional Video Mode: ? I could not find this listed in my Xorg.log file for the nvidia driver. Is this a nv driver output ?

But, it is a "no never mind" now because the new 7667 driver works without any modeline, but I would like to see this output for my monitor (Dell 2000FP)
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Old 06-23-05, 10:37 AM   #46
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Default Re: 7664 and 1600x1200 (maximum pixel clock?)

The "Supported additional Video Mode" comes from the monitor EDIDs. You can get that reported in your Xorg.log by increasing the logging verbosity of the X server. The best solution depends on how your distribution is set up, but invoking X like this should always work (note there are a total of 3 hyphens in there):

startx -- -logverbose 5

For me on Fedora Core 3, the permanent solution was to change these lines in /etc/X11/gdm/gdm.conf from:

[server-Standard]
name=Standard server
command=/usr/X11R6/bin/X -audit 0
flexible=true

to:

[server-Standard]
name=Standard server
command=/usr/X11R6/bin/X -audit 0 -logverbose 5
flexible=true

Note that the monitor's EDIDs often report non-ideal modelines. On my 2001FP, the EDID supplies a 1600x1200 mode at 162 MHz, when in fact a 130.25 MHz mode (as seen above) achieves the same resolution without pushing the limits of DVI bandwidth. Your 2000FP will probably do the same thing.
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Old 06-24-05, 03:42 AM   #47
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Default Re: 7664 and 1600x1200 (maximum pixel clock?)

7667 solves the 1600x1200 on DFP issue. Change the title of this thread to fixed?
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Old 06-25-05, 10:04 AM   #48
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Default Re: 7664 and 1600x1200 (maximum pixel clock?)

Quote:
Originally Posted by arokh
7667 solves the 1600x1200 on DFP issue. Change the title of this thread to fixed?

Nope, Becuase it's still broken for 1920x1080 DFPs.
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