• NAME
  
  rendition - Rendition video driver
• SYNOPSIS
  

  
   "Section qDeviceq"
     Identifier \*q  devname q
       Driver \*qrendition\*q   ...
  
  
    EndSection 

• DESCRIPTION
  
  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.
  
• 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 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
  qDeviceq 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
  qDeviceq section.
  
  
  
  The following driver
  Options are supported:
  

  Option \*qSWCursor\*q \*q boolean q

  Disables use of the hardware cursor. Default: use HW-cursor.
  

  Option \*qOverclockMem\*q \*q boolean q

  Increases the Mem/Sys clock to 125MHz/60MHz from standard 110MHz/50MHz.
  Default: Not overclocked.
  

  Option \*qDacSpeed\*q \*q MHz q

  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 \*qFramebufferWC\*q \*q boolean q

  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 \*qNoDDC\*q \*q boolean q

  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 \*qShadowFB\*q \*q boolean q

  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 \*qRotate\*q \*qCW\*q

  Option \*qRotate\*q \*qCCW\*q

  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 \*qMTRR\*q to let the driver request write-combining of memory access on the video board.
  
• SEE ALSO
  
  Xorg(1) , xorg.conf(5) , Xserver(1) , X(7)
  
• AUTHORS
  
  Authors include: Marc Langenbach, Dejan Ilic
  

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