SIS(4) manual page
Table of Contents
sis - SiS video driver
Section "Device"
Identifier "devname"
Driver "sis"
...
EndSection
sis is an XFree86 driver for SiS (Silicon Integrated Systems)
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 and AGP video cards
based on the following chipsets:
SiS5597/5598 SiS530/620 SiS6326/AGP/DVD
SiS300/305 SiS540 SiS630/730 SiS315/H/PRO SiS550/551/552 SiS650/651/M650/661FX/M661FX/M661MX/740/741/741GX/M741
SiS330 (Xabre) SiS760/M760
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 series for SiS315, 55x and (M)65x/(M)661xX/74x(GX),
330, 760
Please refer to xorg.conf(5x)
for general
configuration details. This section only covers configuration details specific
to this driver.
Detailed information on all supported options can be obtained
at http://www.winischhofer.net/linuxsisvga.shtml
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" "CW"
- Rotate the display clockwise. This mode is unaccelerated,
and uses the Shadow Frame Buffer layer. Using this option disables the Resize
and Rotate extension (RandR). Default: no rotation.
- Option "Rotate" "CCW"
- Rotate the display counterclockwise. This mode is unaccelerated, and uses
the Shadow Frame Buffer layer. Using this option disables the Resize and
Rotate extension (RandR). Default: no rotation.
- Option "ShadowFB" "boolean"
- Enable or disable use of the shadow framebuffer layer. Default: Shadow framebuffer
is off.
- Option "CRT1Gamma" "boolean"
- Enable or disable gamma correction.
Default: Gamma correction is on.
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.
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 chip,
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. 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 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 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
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 series specific
information
The 300 and 315/330 series 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 1024x768.
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 SiS55x, M650, 651, 661FX, M661FX, M661MX, 741, 741GX, M741,
760, M760 support two video overlays. The SiS315/H/PRO, 650/740 and 330
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 channel.
About Merged
Framebuffer support
Merged framebuffer mode is similar to dual head/Xinerama
mode, but has a few advantages which make me recommend it strongly over
Xinerama. Please see http://www.winischhofer.net/linuxsisvga.shtml
for detailed
information.
About dual-head support
Dual head mode with or without Xinerama
is fully supported. Note that colordepth 8 is not supported in dual head
mode.
The following driver Options are supported on the 300 and 315/330
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-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 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 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.winischhofer.net/linuxsisvga.shtml
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 ) and some other modules which come
with either the kernel or the X server.
Sisfb 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 available.
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, I
recommend setting the total video memory in the BIOS to 64MB in order to
at least overcome the lack of memory swap functions.
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.
- 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.
none.
Xorg(1x)
, xorg.conf(5x)
, xorgconfig(1x)
, Xserver(1x)
, X(7)
http://www.winischhofer.net/linuxsisvga.shtml
for more information and updates
Authors include: Alan Hourihane,
Mike Chapman, Juanjo Santamarta, Mitani Hiroshi, David Thomas, Sung-Ching
Lin, Ademar Reis, Thomas Winischhofer
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