man siliconmotion (Fichiers spéciaux) - Silicon Motion video driver


siliconmotion - Silicon Motion video driver


Section qDeviceq

Identifier qdevnameq

Driver qsiliconmotionq


[ Option "optionname" ["optionvalue"]]



siliconmotion is an Xorg driver for Silicon Motion based video cards. The driver is fully accelerated, and provides support for the following framebuffer depths: 8, 16, and 24. All visual types are supported for depth 8, and TrueColor visuals are supported for the other depths.


The siliconmotion driver supports PCI and AGP video cards based on the following Silicon Motion chips:



Please refer to xorg.conf(5) for general configuration details. This section only covers configuration details specific to this driver. All options names are case and white space insensitive when parsed by the server, for example, "lynxe" and "LynxE" are equivalent.

The driver auto-detects the chipset type, but the following ChipSet names may optionally be specified in the config file qDeviceq section, and will override the auto-detection:

"lynx", "lynxe", "lynx3d", "lynxem", "lynxem+", "lynx3dm", "cougar3dr".

The following Cursor Options are supported:

Option qHWCursorq qbooleanq
Enable or disable the HW cursor. Default: on.
Option qSWCursorq qbooleanq
Inverse of "HWCursor". Default: off.

The following display Options are supported:

Option qShadowFBq qbooleanq
Use shadow framebuffer. Default: off.
Option qRotateq qCWq
Option qRotateq qCCWq
Rotate the screen CW - clockwise or CCW - counter clockwise. Uses ShadowFB. Default: no rotation.
Option qVideoKeyq qintegerq
Set the video color key. Default: a little off full blue.
Option qByteSwapq qbooleanq
Turn on byte swapping for capturing using SMI demo board. Default: off.
Option qInterlacedq qbooleanq
Turn on interlaced video capturing. Default: off.
Option qUseBIOSq qbooleanq
Use the BIOS to set the modes. This is used for custom panel timings. Default: on.
Option qZoomOnLCDq qbooleanq
Allow changing resolution on LCD (Ctrl-Alt-Plus and Ctrl-Alt-Minus). Default: off.

The following video memory Options are supported:

Option qset_mclkq qintegerq
sets the memory clock, where integer is in kHz, and integer <= 100000. Default: probe the memory clock value, and use it at server start.

The following acceleration and graphics engine Options are supported:

Option qNoAccelq
Disable acceleration. Very useful for determining if the driver has problems with drawing and acceleration routines. This is the first option to try if your server runs but you see graphic corruption on the screen. Using it decreases performance, as it uses software emulation for drawing operations the video driver can accelerate with hardware. Default: acceleration is enabled.
Option qfifo_aggressiveq
Option qfifo_moderateq
Option qfifo_conservativeq
alter the settings for the threshold at which the pixel FIFO takes over the internal memory bus to refill itself. The smaller this threshold, the better the acceleration performance of the card. You may try the fastest setting (fifo_aggressive) and move down if you encounter pixel corruption. The optimal setting will probably depend on dot-clock and on color depth. Note that specifying any of these options will also alter other memory settings which may increase performance, so trying fifo_conservative will in most cases be a slight benefit (this uses the chip defaults). If pixel corruption or transient streaking is observed during drawing operations then removing any fifo options is recommended. Default: none.

The following PCI bus Options are supported:

Option qpci_burstq qbooleanq
will enable PCI burst mode. This should work on all but a few broken PCI chipsets, and will increase performance. Default: off.
Option qpci_retryq qbooleanq
will allow the driver to rely on PCI Retry to program the ViRGE registers. pci_burst must be enabled for this to work. This will increase performance, especially for small fills/blits, because the driver does not have to poll the ViRGE before sending it commands to make sure it is ready. It should work on most recent PCI chipsets. Default: off.

The following additional Options are supported:

Option qShowCacheq qbooleanq
Enable or disable viewing offscreen cache memory. A development debug option. Default: off.



For assistance with this driver, or Xorg in general, check the Xorg web site at If you find a problem with Xorg or have a question not answered in the FAQ please use our bug report form available on the web site. When reporting problems with the driver send as much detail as possible, including chipset type, a server output log, and operating system specifics.


Kevin Brosius, Matt Grossman, Harald Koenig, Sebastien Marineau, Mark Vojkovich, Frido Garritsen, Corvin Zahn.