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       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 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
              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

       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
       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

       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 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
       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 CRT2).

       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

       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 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

       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), 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.