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       savage - S3 Savage video driver


       Section "Device"
         Identifier "devname"
         Driver "savage"


       savage  is  an  Xorg  driver for the S3 Savage family video accelerator
       chips.  2D, 3D, and Xv acceleration is supported on  all  chips  except
       the  Savage2000  (2D only).  Dualhead operation is supported on MX, IX,
       and SuperSavage chips.  The savage driver supports PCI and  AGP  boards
       with the following chips:

       Savage3D        (8a20 and 8a21) (2D, 3D)

       Savage4         (8a22) (2D, 3D)

       Savage2000      (9102) (2D only)

       Savage/MX       (8c10 and 8c11) (2D, 3D, Dualhead)

       Savage/IX       (8c12 and 8c13) (2D, 3D, Dualhead)

       SuperSavage/MX  (8c22, 8c24, and 8c26) (2D, 3D, Dualhead)

       SuperSavage/IX  (8c2a,  8c2b,  8c2c,  8c2d,  8c2e,  and  8c2f) (2D, 3D,

       ProSavage PM133 (8a25) (2D, 3D)

       ProSavage KM133 (8a26) (2D, 3D)

       Twister (ProSavage PN133)
                       (8d01) (2D, 3D)

       TwisterK (ProSavage KN133)
                       (8d02) (2D, 3D)

       ProSavage DDR   (8d03) (2D, 3D)

       ProSavage DDR-K (8d04) (2D, 3D)


       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 "HWCursor" "boolean"

       Option "SWCursor" "boolean"
              These  two  options  interact  to  specify  hardware or software
              cursor.  If the  SWCursor  option  is  specified,  any  HWCursor
              setting  is  ignored.   Thus, either "HWCursor off" or "SWCursor
              on" will force the use of the software cursor.  On Savage/MX and
              Savage/IX  chips  which are connected to LCDs, a software cursor
              will be forced, because the  Savage  hardware  cursor  does  not
              correctly track the automatic panel expansion feature.  Default:
              hardware cursor.

       Option "NoAccel" "boolean"
              Disable  or  enable  acceleration.   Default:  acceleration   is

       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, but the rendering code for it is newer
              and possibly unstable.  The default is XAA.

       Option "Rotate" "CW"

       Option "Rotate" "CCW"
              Rotate the desktop 90  degrees  clockwise  or  counterclockwise.
              This   option  forces  the  ShadowFB  option  on,  and  disables
              acceleration and the RandR extension.  Default: no rotation.

       Option "ShadowFB" "boolean"
              Enable or disable use of the  shadow  framebuffer  layer.   This
              option disables acceleration.  Default: off.

       Option "LCDClock" "frequency"
              Override  the  maximum  dot  clock.   Some  LCD  panels  produce
              incorrect results if they are driven at too fast of a frequency.
              If  UseBIOS  is  on, the BIOS will usually restrict the clock to
              the correct range.  If not, it might be necessary to override it
              here.  The frequency parameter may be specified as an integer in
              Hz (135750000), or with standard suffixes like "k", "kHz",  "M",
              or "MHz" (as in 135.75MHz).

       Option "CrtOnly" "boolean"
              This option disables output to the LCD and enables output to the
              CRT port only.  It is useful on laptops if you only want to  use
              the  CRT  port  or to force the CRT output only on desktop cards
              that use mobile chips. Default: auto-detect active outputs

       Option "UseBIOS" "boolean"
              Enable or disable  use  of  the  video  BIOS  to  change  modes.
              Ordinarily,  the savage driver tries to use the video BIOS to do
              mode switches.  This generally produces the  best  results  with
              the  mobile  chips  (/MX  and  /IX), since the BIOS knows how to
              handle the critical  but  unusual  timing  requirements  of  the
              various  LCD  panels  supported  by  the  chip.  To do this, the
              driver searches through the BIOS mode list, looking for the mode
              which  most  closely  matches  the  xorg.conf  mode  line.  Some
              purists find this scheme objectionable.   If  you  would  rather
              have  the  savage driver use your mode line timing exactly, turn
              off the UseBios option.  Note: Use of the BIOS is  required  for
              dualhead operation.  Default: on (use the BIOS).

       Option "IgnoreEDID" "boolean"
              Do  not use EDID data for mode validation, but DDC is still used
              for monitor detection. This is different from NoDDC option.
              The default value is off.

       Option "ShadowStatus" "boolean"
              Enables the use of a shadow status register.  There  is  a  chip
              bug in the Savage graphics engine that can cause a bus lock when
              reading the engine status register under  heavy  load,  such  as
              when  scrolling text or dragging windows.  The bug affects about
              4% of all Savage users without DRI and a large fraction of users
              with  DRI.   If your system hangs regularly while scrolling text
              or dragging windows, try turning this option on.  This  uses  an
              alternate  method of reading the engine status which is slightly
              more expensive, but avoids the problem.   When  DRI  is  enabled
              then  the  default  is  "on"  (use shadow status), otherwise the
              default is "off" (use normal status register).

       Option "DisableCOB" "boolean"
              Disables the COB (Command Overflow Buffer) on savage4 and  newer
              chips.   There  is  supposedly  a  HW cache coherency problem on
              certain savage4 and newer chips that renders the COB useless. If
              you are having problems with 2D acceleration you can disable the
              COB, however you will lose some  performance.   3D  acceleration
              requires  the  COB to work.  This option only applies to Savage4
              and newer chips.  Default: "off" (use COB).

       Option "BCIforXv" "boolean"
              Use the BCI to copy and reformat Xv pixel data.  Using  the  BCI
              for  Xv  causes  graphics  artifacts on some chips.  This option
              only applies to Savage4 and  prosavage/twister  chips.  On  some
              combinations of chipsets and video players, BCI formatting might
              actually be slower than software  formatting  ("AGPforXv"  might
              help  in  this  case).  BCI formatting can only be used on video
              data with a width that is a multiple of 16 pixels (which is  the
              vast  majority  of  videos).   Other  widths are handled through
              software formatting. Default: on for prosavage and twister  (use
              BCI for Xv); off for savage4 (do not use the BCI for Xv).

       Option "AGPforXv" "boolean"
              Instructs  the  BCI  Xv  pixel  formatter to use AGP memory as a
              scratch buffer.  Ordinarily the BCI formatter uses a an area  in
              framebuffer  memory to hold YV12 planar data to be converted for
              display. This requires a somewhat expensive upload of YV12  data
              to  framebuffer  memory.  The  "AGPforXv"  option causes the BCI
              formatter to place the YV12 data in AGP  memory  instead,  which
              can  be uploaded faster than the framebuffer. Use of this option
              cuts upload overhead by 25% according to benchmarks. This option
              also smooths out most of the shearing present when using BCI for
              pixel conversion. Currently this option is experimental  and  is
              disabled  by  default.  Video  width  restrictions that apply to
              "BCIforXv" also apply here. Only valid when "DRI" and "BCIforXv"
              are both active, and only on AGP chipsets. Default: "off".
              If "AccelMethod" is set to "EXA" and "AGPforXv" is enabled, then
              the driver will also attempt to reuse the AGP scratch buffer for
              UploadToScreen acceleration.

       Option "AGPMode" "integer"
              Set AGP data transfer rate.  (used only when DRI is enabled)
              1      -- x1 (default)
              2      -- x2
              4      -- x4
              others -- invalid

       Option "AGPSize" "integer"
              The  amount  of  AGP  memory  that  will  allocated  for DMA and
              textures in MB. Valid sizes are 4, 8, 16, 32, 64, 128  and  256.
              The default is 16MB.

       Option "DmaMode" "string"
              This  option  influences in which way DMA (direct memory access)
              is used by the kernel and 3D drivers.
              Any      -- Try command DMA first, then vertex DMA (default)
              Command  -- Only use command DMA or don't use DMA at all
              Vertex   -- Only use vertex DMA or don't use DMA at all
              None     -- Disable DMA
              Command and vertex DMA cannot be enabled at the same time. Which
              DMA  mode  is  actually  used in the end also depends on the DRM
              version (only >= 2.4.0 supports command DMA)  and  the  hardware
              (Savage3D/MX/IX doesn't support command DMA).

       Option "DmaType" "string"
              The  type  of  memory that will be used by the 3D driver for DMA
              (direct memory access).
              PCI    -- PCI memory (default on PCI cards)
              AGP    -- AGP memory (default on AGP cards)
              "AGP" only works if you have an AGP card.

       Option "BusType" "string"
              The bus type that will be used to access the graphics card.
              PCI    -- PCI bus (default)
              AGP    -- AGP bus
              "AGP" only works if you have an AGP card. If you choose "PCI" on
              an  AGP card the AGP bus speed is not set and no AGP aperture is
              allocated. This implies DmaType "PCI".

       Option "DRI" "boolean"
              Enable DRI support.  This option allows you to enable or disable
              the DRI.  Default: "on" (enable DRI).




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


       Authors   include   Tim   Roberts   (   and   Ani  Joshi
       ( for this version, and Tim Roberts and S.  Marineau
       for the original driver from which this was derived.