		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 and ET4000.  We
believe that the ET4000/W32 will work with this release, but we have only
had confirmation of this for some ISA boards.  The ET4000AX is the
"standard" ET4000, and is supported.

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 Xconfig.  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 VGA256 and VGA2 sections of your Xconfig:

  Option "hibit_low"

If the line:

  VGAXXX: ET4000: Initial hibit state: high

is printed, put the following in the VGA256 and VGA2 sections of your Xconfig:

  Option "hibit_high"


3 - Text mode restore problems
------------------------------
  There have been some reports of text mode restore problem with some
ET4000 cards.  If exiting the server or switching VTs fails to restore
text mode properly, try putting 'Option "force_bits"' in your Xconfig
file.  This is an experimental attempt to resolve the problem.  If this
helps, send us some mail.



$XFree86: mit/server/ddx/x386/etc/README.tseng,v 1.4 1993/06/05 02:17:30 dawes Exp $
