mga - Matrox video driver
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
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
- Productiva G100
- Millennium G200 and Mystique G200
- Millennium G400, Millennium G400 MAX, Millennium G450, and Marvel G450
- 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:
"mga2164w", "mga2164w agp", "mgag100",
"mgag200", "mgag200 pci", "mgag400",
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
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.
- 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"
- 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"
- Enable or disable combining the sync signals with the green signal.
- 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:
- Option "TexturedVideo"
- 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"
- 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"
- 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:
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.