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SIS(4x) 										  SIS(4x)

       sis - SiS video driver

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

       sis is an XFree86 driver for SiS video chips. The driver is accelerated, and provides sup-
       port for 8, 16 and 24 colordepths. XVideo, Render and other extensions  are  supported  as

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

       SiS5597/5598  SiS530/620  SiS6326/AGP/DVD SiS300/305 SiS540 SiS630/730 SiS315/H/PRO SiS550
       SiS650/651/650M/740 SiS330 (Xabre)

       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

       310/325/330 series for SiS315/H/PRO, 550 and 650/651/650M/740, 330

       Please refer to XF86Config(5x) for general configuration details.  This section only  cov-
       ers configuration details specific to this driver. Please note that support for the SiS330
       is new and there may be some problems.

       1. For all supported chipsets

       The following driver Options are supported on all chipsets:

       Option "NoAccel" "boolean"
	      Disable or enable 2D acceleration. Please note: On chipsets  with  XVideo  support,
	      this also disables XVideo. 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" "CW"
	      Rotate the display clockwise. This mode is unaccelerated, and uses the Shadow Frame
	      Buffer layer.  Default: no rotation.

       Option "Rotate" "CCW"
	      Rotate the display counterclockwise. This  mode  is  unaccelerated,  and	uses  the
	      Shadow Frame Buffer layer.  Default: no rotation.

       Option "ShadowFB" "boolean"
	      Enable or disable use of the shadow framebuffer layer.  Default: Shadow framebuffer
	      is off.

       2. Old series specific information

       The driver will auto-detect the amount of video memory present for all these chips, but in
       the 6326 case, 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 forced limi-
       tation 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.

       The driver will also auto-detect the maximum dotclock and DAC speed.  If you have problems
       getting	high  resolutions  because  of	dot  clock  limitations, try using the "DacSpeed"
       option, also in the device section. However, this is not recommended  for  the  6326.  For
       this  chipset, the driver has two built-in modes for high resolutions which you should use
       instead. 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.

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

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

       TV support for the 6326

       TV output is supported on the 6326. The driver will auto detect a  TV  connected,  and  in
       this   case  add  the  following  modes	to  the  list  of  default  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 only
	      one cycle per read operation instead of two  cycles.  Disabling  this  will  set	2
	      cycles  for  read  and  write operations. Leaving this option out uses the default.
	      Default: off for read, on for write.

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

       Option "TVXPosOffset" "integer"
	      (6326 only) This option allows horizontal relocation the TV output.  The	range  is
	      from -16 to 16.

       Option "TVYPosOffset" "integer"
	      (6326  only)  This  option  allows vertical relocation the TV output.  The range is
	      from -16 to 16.

       Option "SIS6326TVEnableYFilter" "boolean"
	      (6326 only) This option allows enabling/disabling the Y 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.

       2. 300 and 310/325/330 series specific information

       The 300 and 310/325/330 series 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 SiS301LV SiS302B SiS302LV

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

       About TV output

       On  the SiS301 and the Chrontel 7005, only resolutions up to 800x600 are supported. On all
       others, resolutions up to 1024x768 are supported.

       About XVideo support

       XVideo is supported on all chipsets of both families. However, there are some  differences
       in hardware features which cause limitations.  The 300 series as well as the SiS550, 650M,
       651 and 330 support two video overlays. The SiS315/H/PRO and 650/740 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  chan-

       About dual-head support

       Dual  head  mode has some limitations as regards color depth and resolution. Due to memory
       bandwidth limits, CRT1 might have a reduced refresh rate if running on higher  resolutions
       than 1280x1024.

       Colordepth 8 is not supported when running in dual head mode.

       The following driver Options are supported on the 300 and 310/325 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	automati-
	      cally.  Default: overlay is used on CRT1

       Option "ForceCRT1" "boolean"
	      The  BIOS  detects  VGA monitors connected to CRT1 at boot time and the X driver by
	      default relies on the information passed by the BIOS. However,  some  old  monitors
	      are  not detected correctly. If this is the case, or if you connected the VGA moni-
	      tor after you booted the machine, you may set this option to true in order to  make
	      the  X  driver ignore the information from the BIOS and initialize CRT1 anyway.  If
	      this option is set to false , the driver will switch off CRT1 and thus save  memory
	      bandwidth.  Default: auto detect CRT1

       Option "ForceCRT2Type" "string"
	      Force display type to one of: NONE , TV , SVIDEO , COMPOSITE , SCART, , LCD , VGA ;
	      NONE will disable CRT2. The SVIDEO, COMPOSITE and SCART parameters can be  used  to
	      force the driver to use a specific TV output connector (if present).  Default: auto

       Option "PanelDelayCompensation" "integer"
	      This option is only for machines with a 300 series chipset  and  either  a  SiS301B
	      video  bridge  or a LVDS transmitter.  Different LCD panels require different delay
	      compensation values. In most cases, the driver can autodetect this value.  However,
	      due to bad BIOS design this might fail in rare cases. If your LCD shows small hori-
	      zontal waves, set the parameter of this option first to 4 , 32 or  24  and  if  the
	      problem persists, try using other values between 4 and 60 in steps of 4.

       Option "UseROMData" "boolean"
	      The driver reads some data from the BIOS ROM, especially LCD dependent information.
	      If the folks at SiS some day decide to change the location of this data inside  the
	      BIOS  image,  the  display might not be initialized correctly.  In order to prevent
	      this, set this option's parameter to false.  Default: ROM data is used

       Option "TVStandard" "string"
	      Force the TV standard to either PAL or NTSC.  On some machines  with  630,  730  or
	      650/740, PALM and PALN are supported as well. Default: BIOS setting.

       Option "TVXPosOffset" "integer"
	      This  option  allows horizontal relocation the TV output.  The range is from -32 to
	      32. Not supported on the Chrontel 7019 yet.

       Option "TVYPosOffset" "integer"
	      This option allows vertical relocation the TV output.  The range is from -32 to 32.
	      Not supported on the Chrontel 7019 yet.

       Option "CHTVOverscan" "boolean"
	      On  machines  with  a Chrontel TV encoder, this can be used to force the TV mode to
	      overscan or underscan.  True means overscan, false 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.

       3. 300 series specific information

       DRI  is supported on the 300 series only. DRI requires the kernel's SiS framebuffer driver
       ( sisfb ) and some other modules which come with either the kernel or XFree86.

       Sisfb takes care of memory management for texture data. In order to prevent the	X  driver
       and  sisfb  from  overwriting  each others video memory, 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 available. However, the X
       driver needs to know about the amount of RAM sisfb reserved. For this purpose, the

       Option "MaxXFBMem" "integer"


       At the moment(2002), the SiS DRI driver is not maintained, lacks support for memory swap-
       ping  and  has  a  few bugs. If you intend to use DRI, I recommend setting the total video
       memory in the BIOS to 64MB in order to at least overcome the lack  of  memory  swap  func-

       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 communi-
       cate  with  sisfb  and doesn't require setting the "MaxXFBMem" option at all. The X driver
       will receive enough information from sisfb in this case.

       However, if you use sisfb for 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. In this case, you need to set "MaxXFBMem" to the same value as you gave sisfb with
       its mem parameter. If you didn't specify any mem parameter, 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.

       Then you need to specify any of these amounts as the parameter for the "MaxXFBMem" option.
       The value is to be given without 'KB'.

       For some reason, PAL TV output on the SiS301LV bridge is only black and white. NTSC is OK,

       LCD panels with a resolution of 1280x1024 do not work correctly.

       XFree86(1), XF86Config(5x), xf86config(1), Xserver(1), X(7x)

       http://www.winischhofer.net for more information and updates

       Authors	include:  Alan	Hourihane, Mike Chapman, Juanjo Santamarta, Mitani Hiroshi, David
       Thomas, Sung-Ching Lin, Ademar Reis, Thomas Winischhofer

XFree86 			      Version Version 4.3.0				  SIS(4x)
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