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       voodoo - Voodoo video driver


       Section "Device"
         Identifier "devname"
         Driver "voodoo"


       voodoo  is  an  Xorg  driver  for  Voodoo  1  and Voodoo 2 series video
       adapters.  On the Voodoo 1 the driver uses a shadow  buffer  in  system
       memory as the video adapter has only 3D acceleration. Selected portions
       of the shadow framebuffer are copied out to the  Voodoo  board  at  the
       right  time. Because of this, the speed of the driver is very dependent
       on the CPU. Processors nowadays are actually rather fast at moving data
       so we get very good speed anyway as the shadow framebuffer is in cached

       The Voodoo2 has 16bpp acceleration and the driver provides  accelerated
       versions   of   most  operations  except  angled  lines  and  stipples.
       Accelerated alpha blending with the Render extension is also  supported
       as is DGA.

       This driver supports 16bpp modes currently. The video hardware supports
       image conversion from 24bpp to 16bpp but the hardware is 16bpp only.

       The Voodoo 1 series cards can go up to  800x600  resolution  while  the
       Voodoo  2  can  reach  1024x768  providing it has at least 2Mb of frame
       buffer memory. 1024x768 2D mode does not require two  cards  configured
       in scan-line interleave mode (SLI).

       Multihead and Xinerama configurations are supported. SLI configurations
       will be treated as multiple video cards.

       Limited support for DPMS screen saving is available. The "standby"  and
       "suspend"  modes  are  just  painting  the screen black. The "off" mode
       turns the Voodoo board off and thus works correctly.

       This driver does not support a virtual screen size different  from  the
       display  size.  This is a hardware limitation. 3D rendering is also not


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

       The following driver Options are supported:

       Option "ShadowFB" "boolean"
              Enables   a  shadow  buffer  in  main  memory.  This  turns  off
              acceleration but  for  otherwise  unaccelerated  operations  can
              improve  performance  materially.   Default: off for voodoo2, on
              for voodoo1.

       Option "NoAccel" "boolean"
              Disables acceleration  if  set.  Unless  debugging  this  option
              should  only  be  set  if ShadowFB is enabled.  Default: off for
              voodoo2, on for voodoo1.


       The driver interacts badly with the sstfb frame buffer driver as  there
       is  insufficient information to restore the chip to its previous state.


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


       Authors: Alan Cox, Ghozlane Toumi, Henrik Harmsen.