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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 and G550. Support
for the second head on G400 cards requires a binary-only "mga_hal" module
that is available from Matrox <http://www.matrox.com
>, 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:
Please refer to xorg.conf(5x)
general configuration details. This section only covers configuration details
specific to this driver.
- Millennium (original)
- Millennium II
- Millennium G200 and Mystique
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 "Device" section.
driver Options are supported:
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.
- 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.
- Disable or enable loading the "mga_hal" module. Default:
the module is loaded when available and when using hardware that it supports.
- Option "OverclockMem"
- Set clocks to values used by some commercial X-Servers
(G100, G200 and G400 only). Default: off.
- Option "Overlay" "value"
8+24 overlay mode. Only appropriate for depth 24. Recognized values are:
"8,24", "24,8". Default: off. (Note: the G100 is unaccelerated in the 8+24
overlay mode due to a missing hardware feature.)
- Option "PciRetry" "boolean"
- Enable or disable PCI retries. Default: off.
- Option "Rotate" "CW"
- Rotate the display clockwise or counterclockwise. This mode
is unaccelerated. Default: no rotation.
- Option "ShadowFB" "boolean"
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)
information. Default: off.
- Option "VideoKey" "integer"
- This sets the default
pixel value for the YUV video overlay key. Default: undefined.
- Option "TexturedVideo"
- This has XvImage support use the texture engine rather than the
video overlay. This option is only supported by the G200 and G400, and only
in 16 and 32 bits per pixel. Default: off.
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