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s3virge(4x)									      s3virge(4x)

       s3virge - S3 ViRGE video driver

       Section "Device"
	 Identifier "devname"
	 Driver "s3virge"
	 [ 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.
       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	   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

       Please refer to XF86Config(5x) for general configuration details.  This section only  cov-
       ers  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

       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: 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: off.

       Option "Rotate" "cw | ccw"
	      Rotate the screen CW - clockwise or CCW - counter clockwise.  Disables HW Accelera-
	      tion and HW Cursor, uses ShadowFB.  Default: no rotation.

       Option "XVideo" ["boolean"]
	      Disable  XVideo  support by using the off option.  This changes FIFO settings which
	      prevent screen noise for high-res modes.	Default: on

       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 cor-
	      ruption 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"
	      Change Trio 3D and 3D/2X memory options.	Default: Use BIOS defaults.

       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 server start.

       Option "set_refclk" "integer"
	      sets the ref clock for ViRGE MX, where integer is in kHz.  Default: probe the  mem-
	      ory clock value, and use it at server start.

       The following 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  acceler-
	      ate with hardware.  Default: acceleration is enabled.

       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 inter-
	      nal memory bus to refill itself. The smaller this threshold, the better the  accel-
	      eration  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: 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, espe-
	      cially 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.

       XFree86(1), XF86Config(5x), xf86config(1), Xserver(1), X(7x)

       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 Vojkovich.

XFree86 			      Version Version 4.3.0			      s3virge(4x)
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