NAME

       r128 - ATI Rage 128 video driver

SYNOPSIS

       Section "Device"
         Identifier "devname"
         Driver "r128"
         ...
       EndSection

DESCRIPTION

       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.

SUPPORTED HARDWARE

       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 8MB.

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

           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 "EnablePageFlip" "boolean"
              Enable page flipping for 3D acceleration. This will increase performance but not work correctly in
              some rare cases, hence the default is off.

       Option "RenderAccel" "boolean"
              Enables  or  disables  hardware  Render  acceleration.   It  is  only  supported  when  using  EXA
              acceleration and DRI.  The default is to enable Render acceleration.

       Option "AccelMethod" "string"
              Chooses between available acceleration architectures.  Valid options are XAA and EXA.  XAA is  the
              traditional  acceleration  architecture  and  support  for  it  is  very  stable.   EXA is a newer
              acceleration architecture with better performance for the Render and  Composite  extensions.   The
              default is XAA.

       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.

       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
              architectures.

       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.

SEE ALSO

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

AUTHORS

       Rickard E. (Rik) Faith   faith@precisioninsight.com
       Kevin E. Martin          kevin@precisioninsight.com