Provided by: xserver-xorg-video-rendition_4.2.4-2ubuntu1_amd64 bug


       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