Information for Tseng Chipset Users
		-----------------------------------

Contents
--------
	1) Supported chipsets
	2) Clock selection problems with some ET4000 boards
	3) Text mode restore problems

1 - Supported chipsets
----------------------
  The Tseng chipsets supported by XFree86 are ET3000, ET4000, and
ET4000/W32.  At this time, the accelerated features of the ET4000/W32
are not supported; the chipset is treated as a standard ET4000.

2 - Clock selection problems with some ET4000 boards
----------------------------------------------------
  XFree86 has some problems getting the clock selection right with some
ET4000 boards when the server is started from a high-resolution text mode.
The clock selection is always correct when the server is started from a
standard 80x25 text mode.

This problem is indicated when the reported clocks are different when the
server is started from the high-resolution text mode from what they are
when it is started from the 80x25 text mode.  To allow the server to work
correctly from the high-resolution text mode, there are some Option flags
that may be set in XF86Config.  To find out which flags to set, start the
server with the -probeonly flag from an 80x25 text mode and look at the
information printed by the server.  If the line:

  VGAXXX: ET4000: Initial hibit state: low

is printed, put the following in the SVGA, VGA16 and VGA2 sections of your
XF86Config:

  Option "hibit_low"

If the line:

  VGAXXX: ET4000: Initial hibit state: high

is printed, put the following in the SVGA, VGA16 and VGA2 sections of your
XF86Config:

  Option "hibit_high"


3 - Text mode restore problems
------------------------------
  In XFree86 1.3, an option flag "force_bits" was provided as an experiment
to attempt to alleviate text-restoral problems that some people experienced.
We have now made the behavior of this option the default, hence the flag
has been removed.  Hopefully the past text-restoral problems are alleviated 
in XFree86 2.0.

$XFree86: xc/programs/Xserver/hw/xfree86/doc/README.tseng,v 3.1 1994/09/26 15:33:20 dawes Exp $