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       rendition - Rendition video driver


       Section "Device"
         Identifier "devname"
         Driver "rendition"


       rendition  is  an  Xorg  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.


       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.


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

       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:

           "v1000", "v2x00".

       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  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 performance 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  monitor.  This
              information  is not used yet and is only there for informational
              purposes.  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 beneficial for those
              systems where reading from video memory is, on  average,  slower
              than  the  corresponding  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.


       Xorg(1), xorg.conf(5), Xserver(1), X(7)


       Authors include: Marc Langenbach, Dejan Ilic