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Old 06-03-05, 02:13 PM   #11
NVIDIA Corporation
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Join Date: Oct 2002
Posts: 53
Default Re: 7664 and 1600x1200 (maximum pixel clock?)

The 7664 driver adds more "correct" mode validation checking of the pixel clock (the maximum pixel clock is indeed what is reported in the X log with 7664; the higher number reported in earlier driver versions is incorrect).

However, there is a bug that the mode validation is not properly taking into account reduced blanking, which will be employed when setting the mode. Reduced blanking is a technique for shrinking the blanking regions of a mode, resulting in a lower pixel clock.

This will be addressed in a future driver release, but the work around for 7664 is to add a 1600x1200 modeline with a low enough pixel clock to the Monitor section of your X config file. This one should be sufficient:

Modeline "1600x1200" 145.98 1600 1704 1872 2144 1200 1201 1204 1238 -HSync +Vsync

I apologize for the inconvenience.
Andy Ritger
NVIDIA Linux Graphics Driver Engineer
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