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Old 09-06-05, 08:08 AM   #1
apollo
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Question How to drive Apple HD cinema 30" with GeForce 6800 GT?

Has anybody already succeeded in using the following combination:
-HP xw8200 workstation (or other PC)
-Asus Extreme N6800GT PCI-e graphics card (or other with GeForce 6800 GT GPU)
-Apple HD Cinema 30" screen (2560x1600)
-Red Hat Enterprise Linux WS 3
-NVidia driver 7676

I have experimented with several XF86Config settings, but so far I only managed to get the combination working in resolution 1280x800.

A blocking issue to get the higher resolutions working seems to be that the clock range is limited to 12-165 MHz. As 2560x1600 and 1920x1200 require higher clock frequencies, this results (in the XFree86 log file) in the error: "bad mode clock".

Does anybody have an XFConfig86 that works for this combination?
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Old 09-06-05, 09:38 AM   #2
Thunderbird
 
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Default Re: How to drive Apple HD cinema 30" with GeForce 6800 GT?

Search the forum for a modeline as more people have had this issue. Most modelines use reduced blanking to reduce the needed pixelclock but not sure if it helps enough for the 30" version. Apple for instance recommends a 6800 DDL card for use of this screen on MACs, this apple-specific card ships with a dual link DVI interface which allows for upto 300MHz. Further quadro and 7800GT/GTX cards ship with dual link DVI too.
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Old 09-06-05, 02:07 PM   #3
uOpt
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Default Re: How to drive Apple HD cinema 30" with GeForce 6800 GT?

In practice you can do the 1920x1200 but not the 2560x1600, sorry.
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Old 09-06-05, 07:54 PM   #4
netllama
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Default Re: How to drive Apple HD cinema 30" with GeForce 6800 GT?

apollo,
If your 6800GT has a dual link connector, then you should be able to drive the Apple 30" at its full 2560x1600 native resolution. Please start X with the following command:
startx -- -logverbose 5
and then generate and attach an nvidia-bug-report.log for review.

I will note that I've run that Apple 30" at 2560x1600 on an HP xw8200 with a Quadro 4400 a couple weeks ago with 1.0-7676. The limitation here is purely hardware, not software.

Thanks,
Lonni
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