ATi mach64 + LCD panel

[Greg Trounson]

Gidday,

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 at 60Hz, instead opting for 1280x1024 at 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?

thanks,
Greg