               Information for Alliance Promotion chipset users

               Henrik Harmsen (Henrik.Harmsen@erv.ericsson.se)

                               23 February 1998

1.  Support chipsets

The apm driver in the SVGA server is for Alliance Promotion (www.alsc.com)
graphics chipsets. The following chipsets are supported:

   o  6422

     Old chipset without color expansion hardware (text accel).

   o  AT24

     As found in Diamond Stealth Video 2500. Quite similar to AT3D.

   o  AT25, AT3D

     AT3D is found in Hercules Stingray 128/3D. Most other Voodoo Rush based
     cards use the AT25 which is identical except it doesn't have the 3D
     stuff in it.

2.  Acceleration

The apm driver uses the XAA (XFree86 Acceleration Architecture) in the SVGA
server. It has support for the following acceleration:

   o  Bitblts (rectangle copy operation)

   o  Lines (solid, single pixel)

   o  Filled rectangles

   o  CPU->Screen colour expansion (text accel). Not for 6422.

   o  Hardware cursor

All in 8, 16 and 32 bpp modes. No 24bpp mode is supported.  Also VESA DPMS
power save mode is fully supported with "standby", "suspend" and "off" modes
(set with with the "xset dpms" command).

3.  Configuration

First: Please run the XF86Setup program to create a correct configuration.

You can turn off hardware cursor by inserting the following line in the
Device section of the XF86Config file:

Option "sw_cursor"

Or turn off hardware acceleration:

Option "noaccel"

Please don't specify the amount of video RAM you have or which chipset you
have in the config file, let the driver probe for this. Also please don't put
any "clocks" line in the device section since these chips have a fully pro-
grammable clock that can take (almost) any modeline you throw at it. It might
fail at some specific clock values but you should just try a slightly differ-
ent clock and it should work.

     Generated from XFree86: xc/programs/Xserver/hw/xfree86/doc/sgml/apm.sgml,v 1.1.2.2 1998/02/25 12:20:30 dawes Exp $

