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ATi mach64 + LCD panel


I have a motherboard with an onboard Mach64 chip:
01:07.0 VGA compatible controller: ATI Technologies Inc Rage XL (rev 27)

I am using this with a 17" 1280x1024 LCD panel.

Now when I launch X.Org using the recommended 'ati' driver, any screen updates are terribly slow, not only for 3D but also 2D. Just scrolling a web browser window is unbearably slow (~3fps). Switching to the vesa driver reveals that the graphics chip is quite fast, so the ati driver is clearly defective.

The problem with the VESA driver, however is that it doesn't recognise 1280x1024 60Hz, instead opting for 1280x1024 61Hz, which no known LCD panel can display.

Unfortunately the vesa driver ignores all "NoDDC" "IgnoreEDID" and ModeLine directives. My desired mode is listed in /var/log/Xorg.0.log as a "Future Video Mode" so I assume that is not supported at this time?

So at the moment we seem to have two options: Fast vesa driver at 1024x768 or slow ati driver at 1280x1024. Neither of which is really acceptable.

Any ideas?


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