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       mga - Matrox video driver


       Section "Device"
         Identifier "devname"
         Driver "mga"


       mga  is  an  Xorg  driver  for Matrox video cards.  The driver is fully
       accelerated, and provides support for the following framebuffer depths:
       8,  15,  16,  24,  and  an  8+24  overlay  mode.   All visual types are
       supported for depth 8, and both TrueColor and DirectColor  visuals  are
       supported  for  the  other  depths  except  8+24  mode  which  supports
       PseudoColor, GrayScale and TrueColor.   Multi-card  configurations  are
       supported.   XVideo is supported on G200 and newer systems, with either
       TexturedVideo or video overlay.  The second head of dual-head cards  is
       supported  for  the G450 and G550.  Support for the second head on G400
       cards requires a binary-only "mga_hal" module that  is  available  from
       Matrox  <>, and may be on the CD supplied with the
       card.  That module also provides various other enhancements, and may be
       necessary  to  use  the  DVI  (digital)  output  on the G550 (and other


       The mga driver supports PCI and AGP video cards based on the  following
       Matrox  chips.   They  are listed in approximate chronological order of
       production (with the most recent chipsets listed last), so consult this
       list when you are unsure whether your card is meant when references are
       made to 'G200 and later' chips, for example.



              Millennium II

       G100   Productiva G100

       G200   Millennium G200 and Mystique G200

       G400   Millennium G400,  Millennium  G400  MAX,  Millennium  G450,  and
              Marvel G450 eTV

       G550   Millennium G550 and Millennium G550 Dual DVI


       Please  refer  to xorg.conf(5) for general configuration details.  This
       section only covers configuration details specific to this driver.

       The driver auto-detects the chipset type,  but  the  following  ChipSet
       names  may optionally be specified in the config file "Device" section,
       and will override the auto-detection:

           "mga2064w", "mga1064sg",  "mga2164w",  "mga2164w  agp",  "mgag100",
           "mgag200", "mgag200 pci", "mgag400", "mgag550".

       The G450 is Chipset "mgag400" with ChipRev 0x80.

       The  driver will auto-detect the amount of video memory present for all
       chips except the Millennium II.  In the Millennium II case it  defaults
       to 4096 kBytes.  When using a Millennium II, the actual amount of video
       memory should be specified with a VideoRam entry  in  the  config  file
       "Device" section.

       The following driver Options are supported:

       Option "ColorKey" "integer"
              Set  the  colormap  index  used for the transparency key for the
              depth 8 plane when operating in 8+24 overlay  mode.   The  value
              must be in the range 2-255.  Default: 255.

       Option "HWCursor" "boolean"
              Enable or disable the HW cursor.  Default: on.

       Option "MGASDRAM" "boolean"
              Specify whether G100, G200 or G400 cards have SDRAM.  The driver
              attempts to auto-detect this based on the card's  PCI  subsystem
              ID.   This  option  may be used to override that auto-detection.
              The mga driver is not able to auto-detect  the  presence  of  of
              SDRAM  on  secondary  heads  in multihead configurations so this
              option  will  often  need   to   be   specified   in   multihead
              configurations.  Default: auto-detected.

       Option "NoAccel" "boolean"
              Disable   or  enable  acceleration.   Default:  acceleration  is

       Option "AccelMethod" "string"
              Chooses between  available  acceleration  architectures.   Valid
              options  are  XAA  and EXA.  XAA is the traditional acceleration
              architecture and support for it is very stable.  EXA is a  newer
              acceleration architecture with better performance for the Render
              and Composite extensions, but the rendering code for it is newer
              and possibly unstable.  The default is XAA.

       Option "NoHal" "boolean"
              Disable  or  enable  loading the "mga_hal" module.  Default: the
              module is loaded when available and when using hardware that  it

       Option "OverclockMem"
              Set  clocks  to  values used by some commercial X Servers (G100,
              G200 and G400 only).  Default: off.

       Option "PciRetry" "boolean"
              Enable or disable PCI retries.  Default: off.

       Option "Rotate" "CW"

       Option "Rotate" "CCW"
              Rotate the display clockwise or counterclockwise.  This mode  is
              unaccelerated.  Default: no rotation.

       Option "ShadowFB" "boolean"
              Enable or disable use of the shadow framebuffer layer.  Default:

       Option "SyncOnGreen" "boolean"
              Enable or disable combining the  sync  signals  with  the  green
              signal.  Default: off.

       Option "UseFBDev" "boolean"
              Enable or disable use of on OS-specific fb interface (and is not
              supported on all OSs).  See fbdevhw(4) for further  information.
              Default: off.

       Option "VideoKey" "integer"
              This sets the default pixel value for the YUV video overlay key.
              Default: undefined.

       Option "TexturedVideo" "boolean"
              This has XvImage support use the texture engine rather than  the
              video  overlay.  This option is only supported by G200 and later
              chips, and only at 16 and 32 bits per pixel.  Default: off.

       Option "OldDmaInit" "boolean"
              This forces the driver to use the old  DMA  initialization  path
              for DRI.  Use this option only to support a older version of the
              DRI driver with a newer DRM (version 3.2 or later).  This option
              also  disables  the  use  of  direct  rendering  on  PCI  cards.
              Default: off.

       Option "ForcePciDma" "boolean"
              This forces the use of PCI DMA even if AGP DMA  could  be  used.
              This  option  is primarily intended for testing purposes, but it
              could also be used on systems with a buggy  or  poorly  function
              AGP implementation.  Default: off.


       Xorg(1), xorg.conf(5), Xserver(1), X(7)


       Authors  include:  Radoslaw  Kapitan,  Mark  Vojkovich,  and also David
       Dawes, Guy Desbief, Dirk Hohndel,  Doug  Merritt,  Andrew  E.  Mileski,
       Andrew van der Stock, Leonard N. Zubkoff, Andrew C. Aitchison.