SAVAGE(4)                                                                                                              SAVAGE(4)



NAME
       savage - S3 Savage video driver

SYNOPSIS
       Section "Device"
         Identifier "devname"
         Driver "savage"
         ...
       EndSection

DESCRIPTION
       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, Dualhead)

       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)

CONFIGURATION DETAILS
       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 cur-
              sor.  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 enabled.

       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  dis-
              ables 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  win-
              dows.   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  alter-
              nate  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 accel-
              eration 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  play-
              ers,  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 on PCI cards)
              AGP    -- AGP bus (default on AGP cards)
              "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).

FILES
       savage_drv.o

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

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



X Version 11                                         xf86-video-savage 2.3.2                                           SAVAGE(4)