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s3virge - S3 ViRGE video driver
[ Option "optionname" ["optionvalue"]]
s3virge is an XFree86 driver for S3 based video
cards. The driver is fully accelerated, and provides support for the following
framebuffer depths: 8, 15, 16, and 24. All visual types are supported for
depth 8, and TrueColor visuals are supported for the other depths.
The s3virge driver supports PCI and AGP video cards based on the
following S3 chips:
Please refer to XF86Config(5)
for general configuration details. This section only covers configuration
details specific to this driver. All options names are case and white space
insensitive when parsed by the server, for example, "virge vx" and "VIRGEvx"
- ViRGE VX
- ViRGE DX
- ViRGE GX2
- ViRGE MX
- ViRGE MX+
- Trio 3D
- Trio 3D/2X
- 86C362, 86C368
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:
"virge", "86c325", "virge
vx", "86c988", "virge dx", "86c375", "virge gx", "86c385", "virge gx2",
"86c357", "virge mx", "86c260", "virge mx+", "86c280", "trio 3d", "86c365",
"trio 3d/2x", "86c362", "86c368".
The following Cursor Options are supported:
- Option "HWCursor" ["boolean"]
- Enable or disable the HW cursor. Default:
- Option "SWCursor" ["boolean"]
- Inverse of "HWCursor". Default: off.
following display Options are supported:
- Option "ShadowFB" ["boolean"]
- Use shadow framebuffer. Disables HW acceleration. Default: off.
- Option "Rotate"
"cw | ccw"
- Rotate the screen CW - clockwise or CCW - counter clockwise. Disables
HW Acceleration and HW Cursor, uses ShadowFB. Default: no rotation.
- Disable XVideo support by using the off option. This
changes FIFO settings which prevent screen noise for high-res modes. Default:
The following video memory Options are supported:
- Option "slow_edodram"
- Switch the standard ViRGE to 2-cycle edo mode. Try this if you encounter
pixel corruption on the ViRGE. Using this option will cause a large decrease
in performance. Default: off.
- Option "fpm_vram"
- Switch the ViRGE/VX to fast
page mode vram mode. Default: off.
- Option "slow_dram | fast_dram"
Trio 3D and 3D/2X memory options. Default: Use BIOS defaults.
- Option "early_ras_precharge
- adjust memory parameters. One of these will us the
same settings as your video card defaults, and using neither in the config
file does the same. Default: none.
- Option "set_mclk" "integer"
- sets the
memory clock, where integer is in kHz, and integer <= 100000. Default: probe
the memory clock value, and use it at server start.
- Option "set_refclk"
- sets the ref clock for ViRGE MX, where integer is in kHz. Default:
probe the memory clock value, and use it at server start.
acceleration and graphics engine Options are supported:
- Option "NoAccel"
- Disable acceleration. Very useful for determining if the driver has problems
with drawing and acceleration routines. This is the first option to try
if your server runs but you see graphic corruption on the screen. Using
it decreases performance, as it uses software emulation for drawing operations
the video driver can accelerate with hardware. Default: acceleration is
- Option "UseFB"
- There are two framebuffer rendering methods. fb
and cfb. Both are available in the driver. fb is the newer and default
method. To switch back to cfb use this option with no, off or other negative
parameter. Default: on.
- Option "fifo_aggressive | fifo_moderate | fifo_conservative"
- alter the settings for the threshold at which the pixel FIFO takes over
the internal memory bus to refill itself. The smaller this threshold, the
better the acceleration performance of the card. You may try the fastest
setting (fifo_aggressive) and move down if you encounter pixel corruption.
The optimal setting will probably depend on dot-clock and on color depth.
Note that specifying any of these options will also alter other memory
settings which may increase performance, so trying fifo_conservative will
in most cases be a slight benefit (this uses the chip defaults). If pixel
corruption or transient streaking is observed during drawing operations
then removing any fifo options is recommended. Default: none.
PCI bus Options are supported:
- Option "pci_burst" ["boolean"]
- will enable
PCI burst mode. This should work on all but a few broken PCI chipsets, and
will increase performance. Default: off.
- Option "pci_retry" ["boolean"]
- will allow the driver to rely on PCI Retry to program the ViRGE registers.
pci_burst must be enabled for this to work. This will increase performance,
especially for small fills/blits, because the driver does not have to
poll the ViRGE before sending it commands to make sure it is ready. It
should work on most recent PCI chipsets. Default: off.
The following ViRGE
MX LCD Options are supported:
- Option "lcd_center"
- Option "set_lcdclk" "integer"
- allows setting the clock for a ViRGE MX LCD display. integer is in Hz.
Default: use probed value.
The following additional Options are supported:
- Option "ShowCache" ["boolean"]
- Enable or disable viewing offscreen cache
memory. A development debug option. Default: off.
- Option "mx_cr3a_fix" ["boolean"]
- Enable or disable a cr3a fix added for ViRGE MX. Default: on.
For assistance with
this driver, or XFree86 in general, check the XFree86 web site at http://www.xfree86.org.
A FAQ is available on the web site at http://www.xfree86.org/FAQ/.
find a problem with XFree86 or have a question not answered in the FAQ
please use our bug report form available on the web site or send mail to
XFree86@XFree86.org. When reporting problems with the driver send as much
detail as possible, including chipset type, a server output log, and operating
Kevin Brosius, Matt Grossman, Harald Koenig,
Sebastien Marineau, Mark Vojkovich.
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