SIS(4)                                                                  SIS(4)


       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  col-
       ordepths  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 fol-
       lowing 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 Z7

       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

       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

       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 exclu-
              sive.  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 accelera-
       tion, 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 con-
       nected 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

       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 output.

       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 con-
       trollers  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 trans-
       mitter  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  web-

       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 dis-
       torted on SiS video bridges if running NTSC or PAL-M at 1024x768.

       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  limita-
       tions.  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  informa-

       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

       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-detect

       Option "ForceCRT2Type" "string"
              Force display type to one of: NONE , TV , SVIDEO ,  COMPOSITE  ,
              SVIDEO+COMPOSITE  ,  SCART , LCD , VGA ; NONE will disable CRT2.
              The 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 setting.

       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 setting.

       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  http://www.winis- 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 overwrit-
       ing 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 parame-
       ter, or auto-selected depending on the amount of total video RAM avail-

       Sisfb  can  be used for memory management only, or as a complete frame-
       buffer 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

       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

       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

       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), xorgconfig(1), Xserver(1), X(7) for more  information  and


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

X Version 11                 xf86-video-sis 0.9.3                       SIS(4)

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