Provided by: xserver-xorg-video-sis_0.10.3-3build2_amd64 bug


       sis - SiS and XGI video driver


       Section "Device"
         Identifier "devname"
         Driver "sis"


       sis is an Xorg driver for SiS (Silicon Integrated Systems) and XGI video chips. The driver
       is accelerated and provides support for colordepths of 8, 16 and 24  bpp.  XVideo,  Render
       and other extensions are supported as well.


       The sis driver supports PCI, AGP and PCIe video cards based on the following chipsets:

       SiS5597/5598   SiS530/620  SiS6326/AGP/DVD  SiS300/305  SiS540  SiS630/730  SiS315/E/H/PRO
       SiS550/551/552 SiS650/651/661/741 SiS330 (Xabre) SiS760/761 XGI Volari V3/V5/V8 XGI Volari

       In the following text, the following terms are used:

       old series for SiS5597/5598, 530/620 and 6326/AGP/DVD

       300 series for SiS300/305, 540 and 630/730

       315/330/340  series  for  SiS315,  55x,  330,  661/741/76x  (plus  M,  FX, MX, GX variants
       thereof), 340 and all XGI chips.


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

       Detailed    information    on    all    supported    options    can    be    obtained   at

       This manpage only covers a subset of the supported options.

       1. For all supported chipsets

       The following driver options are supported on all chipsets:

       Option "NoAccel" "boolean"
              Disable or enable 2D acceleration. Default: acceleration is enabled.

       Option "HWCursor" "boolean"
              Enable or disable the HW cursor. Default: HWCursor is on.

       Option "SWCursor" "boolean"
              The opposite of HWCursor. Default: SWCursor is off.

       Option "Rotate" "string"
              Rotate the display clockwise ("CW") or  counter-clockwise  ("CCW").  This  mode  is
              unaccelerated.  Using  this  option  disables  XVideo  and  the  Resize  and Rotate
              extension (RandR). Rotation and reflection  (see  below)  are  mutually  exclusive.
              Default: no rotation.

       Option "Reflect" "string"
              Reflect  (mirror)  the display horizontally ("X"), vertically ("Y") or both ("XY").
              This mode is unaccelerated. Using this option disables XVideo and  the  Resize  and
              Rotate  extension  (RandR).  Rotation  (see  above)  and  reflection  are  mutually
              exclusive.  Default: no reflection.

       Option "CRT1Gamma" "boolean"
              Enable or disable gamma correction. (On the 300 and 315/330/340 series, this option
              only affects CRT1 output).  Default: Gamma correction is enabled.

       2. Old series specific information

       The driver will auto-detect the amount of video memory present for all these chips, but in
       the case of the 6326, it will limit the memory size to 4MB. This is because the 6326's  2D
       engine  can  only  address  4MB.  The remaining memory seems to be intended for 3D texture
       data, since only the 3D engine can address RAM above 4MB. However, you can  override  this
       limitation  using  the "VideoRAM" option in the Device section if your board has more than
       4MB and you need to use it. However, 2D acceleration, XVideo  and  the  HWCursor  will  be
       disabled in this case.

       For  the 6326, the driver has two built-in modes for high resolutions which you should use
       instead of the default ones. These are named "SIS1280x1024-75" and  "SIS1600x1200-60"  and
       they  will  be  added to the list of default modes. To use these modes, just place them in
       your Screen section. Example:

       Modes "SIS1600x1200-60" "SIS1280x1024x75" "1024x768" ...

       Of these modes, 1280x1024 is only available at 8, 15 and 16bpp. 1600x1200 is available  at
       8bpp only.

       TV support for the 6326

       TV  output  is  supported  for the 6326. The driver will auto detect a connected TV and in
       this case add the following  display  modes  to  the  list  of  available  display  modes:
       "PAL800x600", "PAL800x600U", "PAL720x540", "PAL640x480", "NTSC640x480", "NTSC640x480U" and
       "NTSC640x400".  Use these modes like the hi-res modes described above.

       The following driver Options are supported on the old series:

       Option "TurboQueue" "boolean"
              Enable or disable TurboQueue mode.  Default: off for SIS530/620, on for the others

       Option "FastVram" "boolean"
              Enable or disable FastVram mode.  Enabling this sets the video RAM  timing  to  one
              cycle  per read operation instead of two cycles. Disabling this will set two cycles
              for read and write operations. Leaving this option  out  uses  the  default,  which
              varies depending on the chipset.

       Option "NoHostBus" "boolean"
              (SiS5597/5598  only).  Disable  CPU-to-VGA  host bus support. This speeds up CPU to
              video RAM transfers. Default: Host bus is enabled.

       Option "NoXVideo" "boolean"
              Disable XV (XVideo) extension support. Default: XVideo is on.

       Option "NoYV12" "boolean"
              Disable YV12 Xv support. This might me  required  due  to  hardware  bugs  in  some
              chipsets.  Disabling  YV12 support forces Xv-aware applications to use YUV2 or XShm
              for video output.  Default: YV12 support is on.

       Option "TVStandard" "string"
              (6326 only) Valid parameters are PAL or NTSC.  The default is set by  a  jumper  on
              the card.

       Option "TVXPosOffset" "integer"
              (6326  only)  This option allows tuning the horizontal position of the image for TV
              output. The range is from -16 to 16. Default: 0

       Option "TVYPosOffset" "integer"
              (6326 only) This option allows tuning the vertical position of  the  image  for  TV
              output. The range is from -16 to 16. Default: 0

       Option "SIS6326TVEnableYFilter" "boolean"
              (6326  only)  This  option  allows  enabling/disabling the Y (chroma) filter for TV

       Option "SIS6326TVAntiFlicker" "string"
              (6326 only) This option allow enabling/disabling the anti flicker facility  for  TV
              output.  Possible  parameters  are OFF, LOW, MED, HIGH or ADAPTIVE.  By experience,
              ADAPTIVE yields the best results, hence it is the default.

       2. 300 and 315/330/340 series specific information

       The 300 and 315/330/340 series, except the XGI Z7, feature two CRT  controllers  and  very
       often  come  with  a video bridge for controlling LCD and TV output. Hereinafter, the term
       CRT1 refers to the VGA output of the chip, and CRT2 refers to either LCD, TV or  secondary
       VGA.  Due to timing reasons, only one CRT2 output can be active at the same time. But this
       limitation does not apply to using CRT1 and CRT2 at the same time which makes it  possible
       to run the driver in dual head mode.

       The driver supports the following video bridges:

       SiS301 SiS301B(-DH) SiS301C SiS301LV SiS302(E)LV

       Instead  of  a  video bridge, some machines have a third party LVDS transmitter to control
       LCD panels, and/or a Chrontel 7005 or 7019 for TV output. All these are supported as well.

       About TV output

       The driver fully supports standard (PAL, NTSC, PAL-N, PAL-M) S-video or  composite  output
       as  well  as  high  definition  TV (HDTV) output via YPbPr plugs.  For more information on
       HDTV, please consult the author's website.

       As regards S-video and CVBS  output,  the  SiS301  and  the  Chrontel  7005  only  support
       resolutions  up to 800x600. All others support resolutions up to 1024x768. However, due to
       a hardware bug, Xvideo might be distorted on SiS video bridges if running NTSC or PAL-M at

       About XVideo support

       XVideo is supported on all chipsets of both families (except the XGI Volari Z7 which lacks
       hardware support for video overlays). However, there  are  some  differences  in  hardware
       features which cause limitations.  The 300 series as well as the SiS55x, M650, 651, 661FX,
       M661FX, M661MX, 741, 741GX, M741, 76x, M76x support two video overlays. The  SiS315/H/PRO,
       650/740, 330, 340 and the XGI Volari V3, V5 and V8 chips support only one such overlay. On
       chips with two overlays, one overlay is used for CRT1, the other for CRT2.  On  the  other
       chipsets,  the  option "XvOnCRT2" can be used to select the desired output device (CRT1 or

       About Merged Framebuffer support

       Merged framebuffer mode is similar to  dual  head/Xinerama  mode  (for  using  two  output
       devices of one card at the same time), but has a few advantages which make me recommend it
       strongly  over  Xinerama.  Please  see   for
       detailed information.

       About dual-head support

       Dual  head  mode  with or without Xinerama is fully supported, be it with one card driving
       two outputs, be it two cards. Note that colordepth 8 is not supported in dual head mode if
       run on one card with two outputs.

       The following driver Options are supported on the 300 and 315/330/340 series:

       Option "NoXVideo" "boolean"
              Disable XV (XVideo) extension support.  Default: XVideo is on.

       Option "XvOnCRT2" "boolean"
              On  chipsets  with only one video overlay, this option can used to bind the overlay
              to CRT1 ( if a monitor is detected and if this option is either  unset  or  set  to
              false ) or CRT2 ( if a CRT2 device is detected or forced, and if this option is set
              to  true  ).  If  either  only  CRT1  or  CRT2  is  detected,  the  driver  decides
              automatically.  In  Merged  Framebuffer  mode,  this  option  is ignored.  Default:
              overlay is used on CRT1

       Option "ForceCRT1" "boolean"
              Force CRT1 to be on of off. If a monitor is connected, it will be  detected  during
              server start. However, some old monitors are not detected correctly. In such cases,
              you may set this option to on in order to make the driver initialize  CRT1  anyway.
              If  this  option  is  set to off , the driver will switch off CRT1.  Default: auto-

       Option "ForceCRT2Type" "string"
              Force display type to one of: NONE , TV , SVIDEO , COMPOSITE ,  SVIDEO+COMPOSITE  ,
              and SCART parameters are for SiS video bridges only and can be used  to  force  the
              driver  to use a specific TV output connector (if present). For further parameters,
              see the author's website.  Default: auto detect.

       Option "CRT2Gamma" "boolean"
              Enable or disable gamma correction for CRT2. Only supported for SiS video  bridges.
              Default: Gamma correction for CRT2 is on.

       Option "TVStandard" "string"
              Force  the  TV  standard to either PAL or NTSC.  On some machines with 630, 730 and
              the 315/330/340 series, PALM , PALN and NTSCJ are supported as well. Default:  BIOS

       Option "TVXPosOffset" "integer"
              This  option  allows tuning the horizontal position of the image for TV output. The
              range is from -32 to 32. Not supported on the Chrontel 7019. Default: 0

       Option "TVYPosOffset" "integer"
              This option allows tuning the vertical position of the image  for  TV  output.  The
              range is from -32 to 32. Not supported on the Chrontel 7019. Default: 0

       Option "SISTVXScale" "integer"
              This  option  selects the horizontal zooming level for TV output. The range is from
              -16 to 16. Only supported on SiS video bridges. Default: 0

       Option "SISTVYScale" "integer"
              This option selects the vertical zooming level  for  TV  output  in  the  following
              modes:  640x480,  800x600.  On  the  315/330/340  series, also 720x480, 720x576 and
              768x576. The range is from -4 to 3. Only supported on SiS video bridges. Default: 0

       Option "CHTVOverscan" "boolean"
              On machines with a Chrontel TV encoder, this can be used to force the  TV  mode  to
              overscan  or  underscan.   on  means  overscan, off means underscan.  Default: BIOS

       Option "CHTVSuperOverscan" "boolean"
              On machines with a Chrontel 7005 TV encoder, this option enables  a  super-overscan
              mode. This is only supported if the TV standard is PAL. Super overscan will produce
              an image on the TV which is larger than the viewable area.

       The      driver       supports       many       more       options.       Please       see for more information.

       3. 300 series specific information

       DRI is supported on the 300 series only. On Linux, prior to kernel 2.6.3, DRI requires the
       kernel's SiS framebuffer driver ( sisfb ). The SiS DRM kernel driver as well  as  the  SiS
       DRI client driver are required in any case.

       Sisfb,  if  installed  and  running,  takes care of memory management for texture data. In
       order to prevent the X Server and sisfb from overwriting each other's data, sisfb reserves
       an  amount  of  video  memory  for the X driver.  This amount can either be selected using
       sisfb's mem parameter, or auto-selected  depending  on  the  amount  of  total  video  RAM

       Sisfb  can be used for memory management only, or as a complete framebuffer driver. If you
       start sisfb with a valid mode (ie  you  gain  a  graphical  console),  the  X  driver  can
       communicate  with sisfb and doesn't require any manual configuration for finding out about
       the video memory it is allowed to use.

       However, if you are running a 2.4 series Linux kernel  and  use  sisfb  for  video  memory
       management  only,  ie you started sisfb with mode=none and still have a text mode console,
       there is no communication between sisfb and the X driver. For this purpose, the

       Option "MaxXFBMem" "integer"

       exists. This option must be set to the same value as given  to  sisfb  through  its  "mem"
       parameter, ie the amount of memory to use for X in kilobytes.

       If you started sisfb without the mem argument, sisfb will reserve

       12288KB if more than 16MB of total video RAM is available,

       8192KB if between 12 and 16MB of video RAM is available,

       4096KB in all other cases.

       If you intend to use DRI on an integrated chipset (540, 630, 730), I recommend setting the
       total video memory in the BIOS setup utility to 64MB.

       PLEASE NOTE: As of  Linux  2.6.3  and  under  *BSD,  sisfb  is  not  required  for  memory
       management.  Hence,  this  option is mandatory on such systems not running sisfb to decide
       how much memory X should reserve for DRI. If the option  is  omitted,  DRI  will  have  no
       memory  assigned,  and all DRI applications will quit with errors like "failed to allocate
       Z-buffer" or the like.

       Option "DRI" "boolean"
              This option allows enabling or disabling DRI. By default, DRI is on.

       Option "AGPSize" "integer"
              This option allows selecting the amount of AGP memory to  be  used  for  DRI.   The
              amount is to be specified in megabyte, the default is 8.




       Xorg(1), xorg.conf(5), Xserver(1), X(7) for more information and updates


       Author:  Thomas  Winischhofer.  Formerly  based  on  code by Alan Hourihane, Mike Chapman,
       Juanjo Santamarta, Mitani Hiroshi, David Thomas, Sung-Ching Lin, Ademar Reis.