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- This file was taken from the XFREE86 documentation.
- ---------------------------------------------------
-
-
- 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 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
- ------------------------------
- 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: mit/server/ddx/x386/etc/README.tseng,v 2.0 1993/10/18 12:18:03 dawes Exp $
-
- --------------------------------------------------------------------------------------
-
- ##############################################################################
- # #
- # >>>>>>>>>>>>>>> IMPORTANT NOTE FOR SVGATEXTMODE <<<<<<<<<<<<<<<<<<<< #
- # #
- ##############################################################################
- # #
- # Users of SVGATextMode with an ET4000 board MUST put the "hibit_high" or #
- # "hibit"low" option in their XF86Config as well. This means the option #
- # MUST be in TextConfig AND in XF86Config, and it must of course be the #
- # same one in both files. Failure to do so may cause either X or #
- # SVGATextMode to select the wrong clock. Your monitor may not like that. #
- # #
- ##############################################################################
-
- Note also that changing the "hibit" option from low to high or vice versa is
- equivalent to swapping the lower 8 clocks with the higher 8 clocks in the
- "clocks" line in XF86Config or TextConfig.
-
- Example:
-
- clocks 25.1 28.3 32.5 36 40 44.9 50 65
- clocks 50 56.6 65 72 80 90 63 75
- option "hibit_high"
-
- is equivalent to:
-
- clocks 50 56.6 65 72 80 90 63 75
- clocks 25.1 28.3 32.5 36 40 44.9 50 65
- option "hibit_low"
-
-