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       r128 - ATI Rage 128 video driver


       Section "Device"
         Identifier "devname"
         Driver "r128"


       r128 is an Xorg driver for ATI Rage 128 based video cards.  It contains
       full  support  for  8,  15,  16  and  24  bit  pixel  depths,  hardware
       acceleration  of drawing primitives, hardware cursor, video modes up to
       1800x1440 @ 70Hz, doublescan modes (e.g., 320x200 and  320x240),  gamma
       correction  at  all  pixel  depths,  a  fully programming dot clock and
       robust text mode restoration for VT switching.  Dualhead  is  supported
       on M3/M4 mobile chips.


       The  r128  driver supports all ATI Rage 128 based video cards including
       the Rage Fury AGP 32MB, the XPERT 128 AGP 16MB and  the  XPERT  99  AGP


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

       The driver auto-detects all device information necessary to  initialize
       the  card.   However, if you have problems with auto-detection, you can

           VideoRam - in kilobytes
           MemBase  - physical address of the linear framebuffer
           IOBase   - physical address of the MMIO registers
           ChipID   - PCI DEVICE ID

       In addition, the following driver Options are supported:

       Option "SWcursor" "boolean"
              Selects software cursor.  The default is off.

       Option "NoAccel" "boolean"
              Enables or disables all hardware acceleration.  The  default  is
              to enable hardware acceleration.

       Option "Dac6Bit" "boolean"
              Enables  or  disables the use of 6 bits per color component when
              in 8 bpp mode (emulates VGA mode).  By default, all 8  bits  per
              color component are used.  The default is off.

       Option "VideoKey" "integer"
              This overrides the default pixel value for the YUV video overlay
              key.  The default value is undefined.

       Option "Display" "string"
              Select display mode  for  devices  which  support  flat  panels.
              Supported modes are:

              "FP" - use flat panel;

              "CRT" - use cathode ray tube;

              "Mirror" - use both FP and CRT;

              "BIOS" - use mode as configured in the BIOS.

              The default is FP.

       The following Options are mostly important for non-x86 architectures:

       Option "ProgramFPRegs" "boolean"
              Enable  or  disable  programming  of  the  flat panel registers.
              Beware that this may damage your panel, so use this at your  own
              risk.  The default depends on the device.

       Option "PanelWidth" "integer"

       Option "PanelHeight" "integer"
              Override  the  flat panel dimensions in pixels. They are used to
              program the flat panel registers and normally  determined  using
              the  video  card  BIOS.  If  the  wrong dimensions are used, the
              system may hang.

       Option "UseFBDev" "boolean"
              Enable or disable  use  of  an  OS-specific  framebuffer  device
              interface  (which  is not supported on all OSs).  See fbdevhw(4)
              for further information.  Default: on for PowerPC, off for other

       Option "DMAForXv" "boolean"
              Try  or  don't  try to use DMA for Xv image transfers. This will
              reduce CPU usage when playing big  videos  like  DVDs,  but  may
              cause instabilities.  Default: off.

       The following additional Options are supported:

       Option "ShowCache" "boolean"
              Enable or disable viewing offscreen cache memory.  A development
              debug option.  Default: off.

       Option "VGAAccess" "boolean"
              Tell the driver if it can do legacy VGA IOs to the card. This is
              necessary  for properly resuming consoles when in VGA text mode,
              but shouldn't be if the console is using radeonfb or some  other
              graphic  mode  driver.  Some  platforms like PowerPC have issues
              with those, and they aren't necessary unless  you  have  a  real
              text  mode  in  console. The default is off on PowerPC and SPARC
              and on on other architectures.

       Dualhead Note: The video BIOS on some laptops interacts strangely  with
       dualhead.  This can result in flickering and problems changing modes on
       crtc2.  If you experience these problems  try  toggling  your  laptop's
       video  output  switch (e.g., fn-f7, etc.) prior to starting X or switch
       to another VT and back.


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


       Rickard E. (Rik) Faith
       Kevin E. Martin