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  that only VGAWonder-capable adapters can be assigned to the ``Device''
  section.  This specifically excludes the newer integrated Mach64
  controllers.

  In some PCI or AGP systems, the driver will not, by default, probe for
  non-PCI Mach32's or Mach64's.  This is because, before doing any such
  probe, the driver attempts to determine if the probe can cause a
  lockup.  If the driver has enough information to determine that a
  lockup would occur, it will skip the probe.  In some situations, this
  determination cannot be accurate, and the driver will err on the side
  of caution, skipping the probe.  Specifying a ChipSet name of
  ``mach32'' or ``mach64'', as appropriate, will force the driver to
  probe for the non-PCI adapter.  These ChipSet names should, therefore,
  only be used when there is in fact such an adapter in the system.
  They are otherwise equivalent to ``ati''.

  On non-Intel platforms, only ``ati'' and ``mach64'' ChipSet values are
  operative.


  5.3.  ChipID & ChipRev specifications

  These specifications will cause the driver to associate the ``Device''
  section only with an adapter having the same attributes, or an adapter
  whose PCI device ID the driver does not recognise.  In the second
  case, these options cause the driver to treat the adapter as if it was
  one with the specified PCI device ID or revision.  ChipID can only be
  used with Mach32 or Mach64 adapters, and, thus, specifically excludes
  any other adapter from matching the ``Device'' section.  ChipRev is
  meaningful only with Mach64 adapters, and then only if ChipID is also
  specified in the same ``Device'' section.


  5.4.  IOBase

  This option limits the adapters that can be associated with the
  ``Device'' section to the one with the specified I/O base.  This
  option only applies to Mach64 adapters and specifically excludes other
  adapters.


  5.5.  BusID

  This option limits the adapters that can be associated with the
  ``Device'' section to the one with the specified PCI Bus ID.  This
  specification excludes non-PCI adapters.


  5.6.  Clocks

  For the purpose of specifying a clock line in your xorg.conf, one of
  four different situations can occur, as follows.

  Those configuring the driver's generic VGA support for a non-ATI
  adapter, can skip ahead to the ``Clocks for non-ATI adapters'' section
  below.  Those not trying to configure the driver for a Mach64 adapter,
  can skip ahead to the ``Clocks for fixed clock generators on ATI
  adapters'' section below.

  The very earliest Mach64 adapters use fixed (i.e. non-programmable)
  clock generators.  Very few of these (mostly prototypes) are known to
  exist, but if you have one of these, you can also skip ahead to the
  ``Clocks for fixed clock generators on ATI adapters'' section below.

  The two cases that are left deal with programmable clock generators,
  which are used on the great majority of Mach64 adapters.

  If you are uncertain which situation applies to your adapter, you can
  run a clock probe with the command ``X -probeonly''.


  5.6.1.  Clocks for supported programmable clock generators

  At bootup, video BIOS initialisation programmes an initial set of
  frequencies.  Two of these are reserved to allow the setting of modes
  that do not use a frequency from this initial set.  One of these
  reserved slots is used by the BIOS mode set routine, the other by the
  particular driver used (e.g. MS-Windows, AutoCAD, X, etc.).  The clock
  numbers reserved in this way are dependent on the particular clock
  generator used by the adapter.

  The driver currently supports all programmable clock generators known
  to exist on Mach64 adapters.  In this case, the driver will completely
  ignore any xorg.conf clock specification, and programme the clock
  generator as needed by the modes used during the X session.


  5.6.2.  Clocks for unsupported programmable clock generators

  This case is unlikely to occur, but is documented for the sake of
  completeness.

  In this situation, the driver will probe the adapter for clock
  frequencies unless xorg.conf clocks are already specified.  In either
  case, the driver will then attempt to normalise the clocks to one of
  the following specifications:

  BIOS setting 1:

    Clocks   0.000 110.000 126.000 135.000  50.350  56.640  63.000  72.000
             0.000  80.000  75.000  65.000  40.000  44.900  49.500  50.000
             0.000  55.000  63.000  67.500  25.180  28.320  31.500  36.000
             0.000  40.000  37.500  32.500  20.000  22.450  24.750  25.000



  BIOS setting 2:

    Clocks   0.000 110.000 126.000 135.000  25.180  28.320  31.500  36.000
             0.000  80.000  75.000  65.000  40.000  44.900  49.500  50.000
             0.000  55.000  63.000  67.500  12.590  14.160  15.750  18.000
             0.000  40.000  37.500  32.500  20.000  22.450  24.750  25.000



  BIOS setting 3:

    Clocks   0.000   0.000   0.000   0.000  25.180  28.320   0.000   0.000
             0.000   0.000   0.000   0.000   0.000   0.000   0.000   0.000
             0.000   0.000   0.000   0.000  12.590  14.160   0.000   0.000
             0.000   0.000   0.000   0.000   0.000   0.000   0.000   0.000


  If the driver matches the clocks to the third setting above, function-
  ality will be extremely limited (assuming the driver works at all).


  5.6.3.  Clocks for fixed clock generators on ATI adapters

  This section applies to all VGAWonder and Mach32 adapters, and to
  early Mach64 prototypes.

  One of the following clocks specifications (or an initial subset
  thereof) can be used depending on what the adapter uses to generate
  dot clocks:

  Crystals (VGA Wonder V3 and V4 adapters only):

    Clocks  50.000  56.644   0.000  44.900  44.900  50.000   0.000  36.000
            25.000  28.322   0.000  22.450  22.450  25.000   0.000  18.000
            16.667  18.881   0.000  14.967  14.967  16.667   0.000  12.000
            12.500  14.161   0.000  11.225  11.225  12.500   0.000   9.000



  ATI 18810 clock generator:

    Clocks  30.240  32.000  37.500  39.000  42.954  48.771   0.000  36.000
            40.000   0.000  75.000  65.000  50.350  56.640   0.000  44.900
            15.120  16.000  18.750  19.500  21.477  24.386   0.000  18.000
            20.000   0.000  37.500  32.500  25.175  28.320   0.000  22.450
            10.080  10.667  12.500  13.000  14.318  16.257   0.000  12.000
            13.333   0.000  25.000  21.667  16.783  18.880   0.000  14.967
             7.560   8.000   9.375   9.750  10.739  12.193   0.000   9.000
            10.000   0.000  18.750  16.250  12.586  14.160   0.000  11.225



  ATI 18811-0 and ATI 18812-0 clock generators:

    Clocks  30.240  32.000 110.000  80.000  42.954  48.771  92.400  36.000
            39.910  44.900  75.000  65.000  50.350  56.640   0.000  44.900
            15.120  16.000  55.000  40.000  21.477  24.386  46.200  18.000
            19.955  22.450  37.500  32.500  25.175  28.320   0.000  22.450
            10.080  10.667  36.667  26.667  14.318  16.257  30.800  12.000
            13.303  14.967  25.000  21.667  16.783  18.880   0.000  14.967
             7.560   8.000  27.500  20.000  10.739  12.193  23.100   9.000
             9.978  11.225  18.750  16.250  12.588  14.160   0.000  11.225



  ATI 18811-1 and ATI 18811-2 clock generators:

    Clocks 135.000  32.000 110.000  80.000 100.000 126.000  92.400  36.000
            39.910  44.900  75.000  65.000  50.350  56.640   0.000  44.900
            67.500  16.000  55.000  40.000  50.000  63.000  46.200  18.000
            19.955  22.450  37.500  32.500  25.175  28.320   0.000  22.450
            45.000  10.667  36.667  26.667  33.333  42.000  30.800  12.000
            13.303  14.967  25.000  21.667  16.783  18.880   0.000  14.967
            33.750   8.000  27.500  20.000  25.000  31.500  23.100   9.000
             9.978  11.225  18.750  16.250  12.588  14.160   0.000  11.225



  ICS 2494-AM clock generators (found on some Dell motherboards):

    Clocks  75.000  77.500  80.000  90.000  25.175  28.322  31.500  36.000
           100.000 110.000 126.000 135.000  40.000  44.900  50.000  65.000
            37.500  38.750  40.000  45.000  12.588  14.161  15.750  18.000
            50.000  55.000  63.000  67.500  20.000  22.450  25.000  32.500
            25.000  25.833  26.667  30.000   8.392   9.441  10.500  12.000
            33.333  36.667  42.000  45.000  13.333  14.767  16.667  21.667
            18.750  19.375  20.000  22.500   6.294   7.081   7.875   9.000
            25.000  27.500  31.500  33.750  10.000  11.225  12.500  16.250


  VGAWonder VLB, VGA 1024 VLB, Mach32 and Mach64 owners should only
  specify up to the first 32 frequencies.  Any more will be ignored.

  Other clock generators that have been used on ATI adapters (which can
  all be said to be clones of one of the above) might generate non-zero
  frequencies for those that are zero above, or vice-versa.

  The order of the clocks is very important, although the driver will
  reorder the specified clocks if it deems it appropriate to do so.
  Mach32 and Mach64 owners should note that this order is different than
  what they would use for previous accelerated servers.


  5.6.4.  Clocks for non-ATI adapters

  If no clocks are specified in the xorg.conf, the driver will probe for
  four clocks, the second of which will be assumed to be 28.322 MHz.
  The first clock will typically be 25.175 MHz, but there are
  exceptions.  You can include up to four clock frequencies in your
  xorg.conf to specify the actual values used by the adapter.  Any more
  will be ignored.


  5.7.  Option ``nopanel_display''

  This specification is only effective when the driver detects that the
  adapter's BIOS has initialised both the digital flat panel and CRT
  interfaces.  In such a situation, the driver will normally drive both
  the panel and the CRT.  This specification causes the driver to
  disable the digital flat panel and display the screen image on the CRT
  instead, which could potentially allow for larger physical resolutions
  than the panel can handle.


  5.8.  Option ``crt_display''

  This specification is only effective when the driver detects that the
  adapter's BIOS has initialised the digital flat panel interface, but
  has disabled the CRT interface.  In such a situation the driver will
  normally drive only the panel.  This specification causes the driver
  to instead display the same image on both the panel and the CRT.
  5.9.  Option ``noaccel''

  By default, the driver will accelerate draw operations if a Mach64
  CRTC is used to drive the display.  As implemented in this driver,
  acceleration does not require a linear video memory aperture.  This
  option disables this acceleration.


  5.10.  Option ``nolinear''

  By default, the driver will enable a linear video memory aperture for
  256-colour and higher depth modes if it is also using a Mach64
  accelerator CRTC or an integrated Mach64 graphics chip.  This option
  disables this linear aperture.

  On non-Intel platforms, the driver requires a linear aperture and, so,
  this option is ignored.


  5.11.  Option ``HWCursor''  and Option ``SWCursor''

  Option ``HWCursor'', which is the default, specifies that hardware
  facilities are to be used to paint the mouse pointer on the screen.
  Option ``SWCursor'' specifies that the mouse pointer is to be drawn by
  software, which is much slower.  If both options are specified, option
  ``SWCursor'' prevails.  Currently, these options are only acted upon
  for 256-colour or higher depth modes, if a Mach64 accelerator CRTC, or
  a Mach64 integrated controller is being used.  In all other
  situations, a software cursor will be used, regardless of what these
  options specify.


  5.12.  Option ``SilkenMouse''

  This option is only acted upon when a hardware cursor is being used.
  It specifies that the cursor's position on the screen is to be updated
  as quickly as possible when the mouse is moved.  This is the default
  behaviour.  If this option is negated, the cursor may lag the mouse
  when the X server is very busy.