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RENDITION(4)		     XFree86		     RENDITION(4)



NAME

       rendition - Rendition video driver


SYNOPSIS

       Section "Device"
	 Identifier "devname"
	 Driver "rendition"
	 ...
       EndSection


DESCRIPTION

       rendition  is an XFree86 driver for Rendition/Micron based
       video cards.  The driver	 supports  following  framebuffer
       depths: 8, 15 (Verite V1000 only), 16 and 24. Acceleration
       and multi-head configurations are not supported	yet,  but
       are work in progress.


SUPPORTED HARDWARE

       The  rendition  driver  supports	 PCI  and AGP video cards
       based on the following Rendition/Micron chips:

       V1000	   Verite V1000 based cards.

       V2100	   Verite V2100 based cards. Diamond  Stealth  II
		   S220 is the only known such card.

       V2200	   Verite V2200 based cards.


CONFIGURATION DETAILS

       Please  refer  to  XF86Config(5) for general configuration
       details.	 This section only covers  configuration  details
       specific to this driver.

       The  driver auto-detects the chipset type, but the follow
       ing ChipSet names may optionally be specified in the  con
       fig  file  "Device"  section,  and will override the auto-
       detection:

	   "v1000", "v2100", "v2200".

       The driver will auto-detect the	amount	of  video  memory
       present for all chips. If the amount of memory is detected
       incorrectly, the actual amount of video memory  should  be
       specified  with	a  VideoRam  entry  in	the  config  file
       "Device" section.

       The following driver Options are supported:

       Option "SWCursor" "boolean"
	      Disables use of the hardware cursor.  Default:  use
	      HW-cursor.

       Option "OverclockMem" "boolean"
	      Increases	 the  Mem/Sys  clock to 125MHz/60MHz from



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RENDITION(4)		     XFree86		     RENDITION(4)


	      standard 110MHz/50MHz.  Default: Not overclocked.

       Option "DacSpeed" "MHz"
	      Run the memory at a higher clock.	 Useful	 on  some
	      cards  with display glitches at higher resolutions.
	      But adds the risk to damage the hardware. Use  with
	      caution.

       Option "FramebufferWC" "boolean"
	      If  writecombine	is  disabled in BIOS, and you add
	      this option in configuration file, then the  driver
	      will  try	 to  request  writecombined access to the
	      framebuffer. This can drastically increase the per
	      formance	on  unaccelerated  server.  Requires that
	      "MTRR"-support  is  compiled  into  the  OS-kernel.
	      Default:	  Disabled   for   V1000,   enabled   for
	      V2100/V2200.

       Option "NoDDC" "boolean"
	      Disable probing of DDC-information from your  moni
	      tor.  This  information is not used yet and is only
	      there for informational purposes. This might change
	      before  final  XFree86 4.0 release. Safe to disable
	      if you experience problems  during  startup  of  X-
	      server.  Default: Probe DDC.

       Option "ShadowFB" "boolean"
	      If  this	option	is enabled, the driver will cause
	      the CPU to do each drawing operation first  into	a
	      shadow  frame  buffer  in system virtual memory and
	      then copy the result into	 video	memory.	 If  this
	      option  is  not  active, the CPU will draw directly
	      into video memory.  Enabling this option is benefi
	      cial  for	 those	systems	 where reading from video
	      memory is, on average, slower than the  correspond
	      ing  read/modify/write  operation in system virtual
	      memory.  This is normally the case for PCI  or  AGP
	      adapters,	 and,  so,  this  option  is  enabled  by
	      default unless acceleration is  enabled.	 Default:
	      Enabled unless acceleration is used.

       Option "Rotate" "CW"

       Option "Rotate" "CCW"
	      Rotate  the  display clockwise or counterclockwise.
	      This mode is unaccelerated.  Default: no	rotation.


       Notes  For  the	moment the driver defaults to not request
	      write-combine for any chipset  as	 there	has  been
	      indications  of problems with it. Use Option "MTRR"
	      to let the driver request write-combining of memory
	      access on the video board.




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RENDITION(4)		     XFree86		     RENDITION(4)



SEE ALSO

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


AUTHORS

       Authors include: Marc Langenbach, Dejan Ilic




















































4.2.0			     Version				3