s3virge - S3 ViRGE video driver
[ Option "optionname" ["optionvalue"]]
s3virge is an Xorg 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. XVideo
hardware up scaling is supported in depth 16 and 24 on the DX, GX, GX2,
MX, MX+, and Trio3D/2X. Doublescan modes are supported and tested in
depth 8 and 16 on DX, but disable XVideo. Doublescan modes on other
chipsets are untested.
The s3virge driver supports PCI and AGP video cards based on the
following S3 chips:
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
Please refer to xorg.conf(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" are equivalent.
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",
The following Cursor Options are supported:
Option "HWCursor" ["boolean"]
Enable or disable the HW cursor. Default: on.
Option "SWCursor" ["boolean"]
Inverse of "HWCursor". Default: off.
The following display Options are supported:
Option "ShadowFB" ["boolean"]
Use shadow framebuffer. Disables HW acceleration. Default:
Option "Rotate" "cw | ccw"
Rotate the screen CW - clockwise or CCW - counter clockwise.
Disables HW Acceleration and HW Cursor, uses ShadowFB. Default:
Option "XVideo" ["boolean"]
Disable XVideo support by using the off option. This changes
FIFO settings which prevent screen noise for high-res modes.
The following video memory Options are supported:
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.
Switch the ViRGE/VX to fast page mode vram mode. Default: off.
Option "slow_dram | fast_dram"
Change Trio 3D and 3D/2X memory options. Default: Use BIOS
Option "early_ras_precharge | late_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
Option "set_refclk" "integer"
sets the ref clock for ViRGE MX, where integer is in kHz.
Default: probe the memory clock value, and use it at server
The following acceleration and graphics engine Options are supported:
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 enabled.
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.
The following 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:
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 "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.
Xorg(1), xorg.conf(5), Xserver(1), X(7)
The VideoRam generic driver parameter is presently ignored by the
s3virge driver. On PPC this is reported to cause problems for 2M
cards, because they may autodetect as 4M.
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/. If you 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 system specifics.
Kevin Brosius, Matt Grossman, Harald Koenig, Sebastien Marineau, Mark