There are several known problems with the current version of the Mach64 X server. They include:
If you are experiencing problems, first check to make sure that you have the very latest available release (including beta releases). ATI releases new cards throughout the year. Each of these new cards require additional programming to support the new Mach64 chips, RAMDACs and clock chips that appear on them. The most recent release is most likely to support your video card.
Second, please check the RELNOTES and README files (as well as the other documentation available with the release). Third, make sure you do not have any Ramdac, ClockChip or Clocks lines in your XF86Config file (all of these are automatically detected by the Mach64 X server). The "Device" section should only contain the Identifier, VendorName and BoardName. All other options should be automatically detected.
If you are still experiencing problems, please send e-mail to XFree86@XFree86.org or post to the comp.windows.x.i386unix newsgroup.
Please do NOT send e-mail to me since the developers who answer e-mail sent to XFree86@XFree86.org are better able to answer most questions and I would like to spend my minimal free time working on new enhancements to the X server. Thanks!
$XFree86: xc/programs/Xserver/hw/xfree86/doc/sgml/Mach64.sgml,v 184.108.40.206 1999/07/05 09:07:28 hohndel Exp $ $XConsortium: Mach64.sgml /main/8 1996/10/28 05:23:52 kaleb $