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i810 - Intel 8xx integrated graphics chipsets
i810 is an XFree86 driver for Intel integrated graphics chipsets.
The driver supports depths 8, 15, 16 and 24. All visual types are supported
in depth 8. For the i810/i815 other depths support the TrueColor and DirectColor
visuals. For the 830M and later, only the TrueColor visual is supported
for depths greater than 8. The driver supports hardware accelerated 3D
via the Direct Rendering Infrastructure (DRI), but only in depth 16 for
the i810/i815 and depths 16 and 24 for the 830M and later.
supports the i810, i810-DC100, i810e, i815, 830M, 845G, 852GM, 855GM, and
Please refer to XF86Config(5)
configuration details. This section only covers configuration details specific
to this driver.
The Intel 8xx family of integrated graphics chipsets has
a unified memory architecture and uses system memory for video ram. For
the i810 and i815 familiy of chipset, operating system support for allocating
system memory for video use is required in order to use this driver. For
the 830M and later, this is required in order for the driver to use more
video ram than has been pre-allocated at boot time by the BIOS. This is
usually achieved with an "agpgart" or "agp" kernel driver. Linux, and recent
versions of FreeBSD, OpenBSD and NetBSD have such kernel drivers available.
By default 8 Megabytes of system memory are used for graphics. For the
830M and later, the default is 8 Megabytes when DRI is not enabled and
32 Megabytes with DRI is enabled. This amount may be changed with the VideoRam
entry in the config file Device section. It may be set to any reasonable
value up to 64MB for older chipsets or 128MB for newer chipets. It is advisable
to check the XFree86 log file to check if any features have been disabled
because of insufficient video memory. In particular, DRI support or tiling
mode may be disabled with insufficient video memory. Either of these being
disabled will reduce performance for 3D applications. Note however, that
increasing this value too much will reduce the amount of system memory
available for other applications.
The driver makes use of the video BIOS
to program video modes for the 830M and later. This limits the video modes
that can be used to those provided by the video BIOS, and to those that
will fit into the amount of video memory that the video BIOS is aware of.
The following driver Options are supported
- Option "NoAccel" "boolean"
or enable acceleration. Default: acceleration is enabled.
- Option "SWCursor"
- Disable or enable software cursor. Default: software cursor is
disable and a hardware cursor is used for configurations where the hardware
cursor is available.
- Option "ColorKey" "integer"
- This sets the default pixel
value for the YUV video overlay key. Default: undefined.
- Option "CacheLines"
- This allows the user to change the amount of graphics memory
used for 2D acceleration and video. Decreasing this amount leaves more
for 3D textures. Increasing it can improve 2D performance at the expense
of 3D performance. Default: depends on the resolution, depth, and available
video memory. The driver attempts to allocate at least enough to hold two
DVD-sized YUV buffers by default. The default used for a specific configuration
can be found by examining the XFree86 log file.
- Option "DRI" "boolean"
or enable DRI support. Default: DRI is enabled for configurations where
it is supported.
The following driver Options are supported for the i810
and i815 chipsets:
- Option "DDC" "boolean"
- Disable or enable DDC support.
- Option "Dac6Bit" "boolean"
- Enable or disable 6-bits per
RGB for 8-bit modes. Default: 8-bits per RGB for 8-bit modes.
- Option "XvMCSurfaces"
- This option enables XvMC. The integer parameter specifies the
number of surfaces to use. Valid values are 6 and 7. Default: XvMC is disabled.
The following driver Options are supported for the 830M and later chipsets:
Keith Whitwell, and also Jonathan Bian, Matthew J Sottek, Jeff Hartmann,
Mark Vojkovich, Alan Hourihane, H. J. Lu. 830M and 845G support reworked
for XFree86 4.3 by David Dawes and Keith Whitwell. 852GM, 855GM, and 865G
support added by David Dawes and Keith Whitwell.
- Option "VBERestore" "boolean"
- Enable or disable the use of VBE save/restore
for saving and restoring the initial text mode. This is disabled by default
because it causes lockups on some platforms. However, there are some cases
where it must enabled for the correct restoration of the initial video
mode. If you are having a problem with that, try enabling this option.
- Option "VideoKey" "integer"
- This is the same as the "ColorKey"
option described above. It is provided for compatibility with most other
- Option "XVideo" "boolean"
- Disable or enable XVideo support. Default:
XVideo is enabled for configurations where it is supported.
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