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Old 06-24-05, 07:25 PM   #23
aritger
NVIDIA Corporation
 
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Join Date: Oct 2002
Posts: 53
Default Re: Reduced Blanking on DVI-D

haynold, kulick, and others:

We at NVIDIA are paying attention to this problem, and hope to
improve the situation in the NVIDIA Linux driver in a future
driver release.

To clarify a few points:

Drivers prior to 7664 had a bug in how they were computing the
maximum TMDS pixel clock. In the 7664 and 7667 drivers, the maximum
pixel clock is now correctly computed, but unforunately this causes
some modes to be invalidated that apparently worked perfectly
fine previously.

The cutoff between single link and dual link TMDS is 165 MHz.
Some NVIDIA graphics boards have TMDS controllers than can only go
up to frequencies less than this. The X log will report this maximum pixel
clock. I expect this information is also available from the graphics board
manufacturer.

I agree that this is unfortunate, and NVIDIA will explore solutions
such that the correct maximum pixel clock can be respected, yet
the resolutions that previously worked continue to work.

The easiest solution I can recommend today is to stick with 7174.
If you want to use a more recent driver, then in most cases you
can work around the problem by tweaking your modelines as described
in this thread and elsewhere.

In many cases, generating a verbose X log `startx -- -logverbose 5`,
and reading the detailed timing information in the EDID information
in the log will give you the modetimings to use in your modeline.

We are working hard to improve the ease of display configurability
of the NVIDIA driver, and hope to deliver this in a future driver
release.

Thanks.
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Andy Ritger
NVIDIA Linux Graphics Driver Engineer
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