mga - Matrox video driver
Section "Device"
  Identifier "devname"
  Driver "mga"
  ...
EndSection
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.
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.
  - MGA2064W
- MGA1064SG
- Mystique
- MGA2164W
- 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 enabled.
- 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 "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: off.
- 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.