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Old 06-22-05, 12:59 PM   #44
Todd Kulick
Join Date: Jun 2005
Location: Like, in the Bay Area
Posts: 23
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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