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       openchrome - video driver for VIA Unichromes

       Section "Device"
	 Identifier "devname"
	 Driver "openchrome"

       openchrome  is  an Xorg driver for VIA chipsets that have an integrated
       Unichrome graphics engine.

       The  openchrome	driver	supports  the  following   chipsets:   CLE266,
       KM400/KN400/KM400A/P4M800,	CN400/PM800/PN800/PM880,       K8M800,
       CN700/VM800/P4M800Pro,  CX700,  P4M890,	 K8M890,   P4M900/VN896/CN896,
       VX800,  VX855  and  VX900.   The driver includes 2D acceleration and Xv
       video overlay extensions.  Flat panel, TV, and  VGA  outputs  are  sup‐
       ported, depending on the hardware configuration.

       3D  direct  rendering is available using experimental drivers from Mesa
       (  There is also an XvMC client	library	 for  hardware
       acceleration  of	 MPEG1/MPEG2  decoding	(not available on the KM/N400)
       that uses the Direct Rendering Infrastructure (DRI).  The  XvMC	client
       library implements a non-standard "VLD" extension to the XvMC standard.
       The current Direct Rendering Manager (DRM) kernel module	 is  available

       The  driver  supports  free  modes  for	Unichrome Pros (K8M800/K8N800,
       PM800/PN800, and CN400).	 For plain Unichromes  (CLE266,	 KM400/KN400),
       it currently supports only a limited number of dotclocks, so if you are
       using X modelines you must make sure that the dotclock is one of	 those
       supported.   Supported  dotclocks on plain Unichromes are currently (in
       MHz): 25.2, 25.312, 26.591, 31.5, 31.704, 32.663, 33.750,  35.5,	 36.0,
       39.822,	40.0,  41.164, 46.981, 49.5, 50.0, 56.3, 57.284, 64.995, 65.0,
       65.028,	74.480,	 75.0,	78.8,  81.613,	94.5,  108.0,  108.28,	122.0,
       122.726,	 135.0,	 148.5,	 155.8,	 157.5,	 161.793, 162.0, 175.5, 189.0,
       202.5, 204.8, 218.3, 229.5.  On top  of	this,  bandwidth  restrictions
       apply for both Unichromes and Unichrome Pros.

       Please  refer  to xorg.conf(5) for general configuration details.  This
       section only covers configuration details specific to this driver.

       The following driver options are supported:

       Option "AccelMethod"  "string"
	      The driver supports "XAA" and "EXA" acceleration	methods.   The
	      default  method  is  XAA, since EXA is still experimental.  Con‐
	      trary to XAA, EXA implements acceleration for screen uploads and
	      downloads	 (if  DRI  is  enabled)	 and  for the Render/Composite

       Option "ActiveDevice"  "string"
	      Specifies the active device combination.	Any string  containing
	      "CRT",  "LCD",  "DFP", "TV" should be possible. "CRT" represents
	      anything that is connected to the VGA port, "LCD" is for	laptop
	      panels  (not TFT screens attached to the VGA port), "DFP" is for
	      screens connected to the DVI  port,  "TV"	 is  self-explanatory.
	      The default is to use what is detected.  The driver is currently
	      unable to use LCD and TV simultaneously,	and  will  favour  the
	      LCD.   The  DVI  port  is	 not  properly	probed and needs to be
	      enabled with this option.

       Option "AGPMem"	"integer"
	      Sets the amount of AGP memory that  is  allocated	 at  X	server
	      startup.	 The  allocated memory will be "integer" kB.  This AGP
	      memory is used  for  the	AGP  command  buffer  (if  the	option
	      "EnableAGPDMA"  is set to "true"), for DRI textures, and for the
	      EXA scratch area.	 The driver will allocate at least one	system
	      page  of	AGP memory, or -- if the AGP command buffer is used --
	      at least 2 MB plus one system page.  If there is no room for the
	      EXA  scratch  area in AGP space, it will be allocated from VRAM.
	      If there is no room for DRI textures,  they  will	 be  allocated
	      from  the	 DRI  part  of VRAM (see the option "MaxDRIMem").  The
	      default amount of AGP is 32768 kB.  Note that the	 AGP  aperture
	      set  in  the  BIOS must be able to accommodate the amount of AGP
	      memory specified here.  Otherwise no AGP memory will  be	avail‐
	      able.  It is safe to set a very large AGP aperture in the BIOS.

       Option "Center"	"boolean"
	      Enables  image  centering	 on DVI displays.  The default is dis‐

       Option "DisableIRQ"  "boolean"
	      Disables the vertical blank IRQ.	This is a workaround for  some
	      mainboards   that	 have  problems	 with  IRQs  coming  from  the
	      Unichrome engine.	 With IRQs disabled, DRI clients have  no  way
	      to  synchronize  their  drawing  to Vblank.  (IRQ is disabled by
	      default on the KM400 and K8M800 chipsets.)

       Option "DisableVQ"  "boolean"
	      Disables the use of the virtual command  queue.	The  queue  is
	      enabled by default.

       Option "EnableAGPDMA"  "boolean"
	      Enables  the  AGP	 DMA functionality in DRM.  This requires that
	      DRI is enabled and will force 2D and 3D acceleration to use  AGP
	      DMA.   The  XvMC	DRI  client  will also make use of this on the
	      CLE266 to consume much less CPU.	(This  option  is  enabled  by
	      default, except on the K8M890 and P4M900.)

       Option "ExaNoComposite"	"boolean"
	      If  EXA is enabled (using the option "AccelMethod"), this option
	      enables acceleration of compositing.  Since EXA, and in particu‐
	      lar its composite acceleration, is still experimental, this is a
	      way to disable a misbehaving composite acceleration.

       Option "ExaScratchSize"	"integer"
	      Sets the size of the EXA scratch area  to	 "integer"  kB.	  This
	      area  is used by EXA as a last place to look for available space
	      for pixmaps.  Too little space will slow compositing down.  This
	      option should be set to the size of the largest pixmap used.  If
	      you have a screen width of over 1024 pixels and use 24 bpp,  set
	      this to 8192.  Otherwise you can leave this at the default 4096.
	      The space will be allocated from AGP memory if available, other‐
	      wise from VRAM.

       Option "LCDDualEdge"  "boolean"
	      Enables  the  use of dual-edge mode to set the LCD.  The default
	      is disabled.

       Option "MaxDRIMem"  "integer"
	      Sets the maximum amount of VRAM memory allocated for DRI clients
	      to  "integer"  kB.  Normally DRI clients	get half the available
	      VRAM size, but in some cases it may make	sense  to  limit  this
	      amount.	For  example, if you are using a composite manager and
	      you want to give as much memory as possible to  the  EXA	pixmap
	      storage area.

       Option "MigrationHeuristic"  "string"
	      Sets  the	 heuristic  for	 EXA pixmap migration.	This is an EXA
	      core option, and starting from Xorg server  version  1.3.0  this
	      defaults	to "always".  The openchrome driver performs best with
	      "greedy", so you should really add this option to your  configu‐
	      ration file.  The third possibility is "smart".

       Option "NoAccel"	 "boolean"
	      Disables	the  use  of  hardware	acceleration.  Acceleration is
	      enabled by default.

       Option "NoAGPFor2D"  "boolean"
	      Disables the use of AGP DMA for 2D acceleration, even  when  AGP
	      DMA is enabled.  The default is enabled.

       Option "NoXVDMA"	 "boolean"
	      If  DRI  is  enabled, Xv normally uses PCI DMA to transfer video
	      images from system to frame-buffer  memory.   This  is  somewhat
	      slower than direct copies due to the limitations of the PCI bus,
	      but on the other hand it decreases CPU usage significantly, par‐
	      ticularly on computers with fast processors.  Some video players
	      are buggy and will display rendering artifacts when PCI  DMA  is
	      used.   If you experience this, or don't want your PCI bus to be
	      stressed with Xv images, set this option to "true".  This option
	      has no effect when DRI is not enabled.

       Option "PanelSize"  "string"
	      Specifies the size (width x height) of the LCD panel attached to
	      the system.  The sizes 640x480,  800x600,	 1024x768,  1280x1024,
	      and 1400x1050 are supported.

       Option "RotationType"  "string"
	      Enabled  rotation	 by using RandR. The driver only support unac‐
	      celerated	 RandR	 rotations   "SWRandR".	  Hardware   rotations
	      "HWRandR" is currently unimplemented.

       Option "Rotate"	"string"
	      Rotates  the  display  either clockwise ("CW"), counterclockwise
	      ("CCW") and upside-down ("UD"). Rotation is only supported unac‐
	      celerated.   Adding option "Rotate", enables RandR rotation fea‐
	      ture.  The RandR allows clients to dynamically change X screens.

       Option "ShadowFB"  "boolean"
	      Enables the use of a shadow frame buffer.	 This is required when
	      rotating the display, but otherwise defaults to disabled.

       Option "SWCursor"  "boolean"
	      Enables  the use of a software cursor.  The default is disabled:
	      the hardware cursor is used.

       Option "TVDeflicker"  "integer"
	      Specifies the deflicker setting for TV output.  Valid values are
	      "0",  "1",  and  "2".   Here 0 means no deflicker, 1 means 1:1:1
	      deflicker, and 2 means 1:2:1 deflicker.

       Option "TVDotCrawl"  "boolean"
	      Enables dot-crawl suppression.  The default is disabled.

       Option "TVOutput"  "string"
	      Specifies which TV output	 to  use.   The	 driver	 supports  "S-
	      Video",  "Composite",  "SC",  "RGB",  and "YCbCr" outputs.  Note
	      that on some EPIA boards the composite-video port is shared with
	      audio-out and is selected via a jumper.

       Option "TVPort"	"string"
	      Specifies	 TV  port.   The  driver  currently  supports  "DVP0",
	      "DVP1", "DFPHigh" and "DFPLow" ports.

       Option "TVType"	"string"
	      Specifies TV  output  format.   The  driver  currently  supports
	      "NTSC" and "PAL" timings only.

       Option "VBEModes"  "boolean"
	      Enables  the use of VBE BIOS calls for setting the display mode.
	      This mimics the behaviour of the vesa driver but still  provides
	      acceleration  and	 other	features.   This option may be used if
	      your hardware works with	the  vesa  driver  but	not  with  the
	      openchrome  driver.   It	may not work on 64-bit systems.	 Using
	      "VBEModes" may speed up driver acceleration significantly due to
	      a more aggressive hardware setting, particularly on systems with
	      low memory bandwidth.  Your refresh rate may be limited to 60 Hz
	      on some systems.

       Option "VBESaveRestore"	"boolean"
	      Enables  the  use of VBE BIOS calls for saving and restoring the
	      display state when the  X	 server	 is  launched.	 This  can  be
	      extremely	 slow  on  some hardware, and the system may appear to
	      have locked for 10 seconds or so.	 The default  is  to  use  the
	      driver builtin function.	This option only works if option "VBE‐
	      Modes" is enabled.

       Option "VideoRAM"  "integer"
	      Overrides the VideoRAM  autodetection.   This  should  never  be

       Unichromes tend to be paired with several different TV encoders.

       VIA Technologies VT1621
	      Still  untested,	as no combination with a Unichrome is known or
	      available.  Supports the following normal modes:	"640x480"  and
	      "800x600".   Use	"640x480Over"  and  "800x600Over" for vertical
	      overscan.	 These modes are made available by the	driver;	 mode‐
	      lines provided in xorg.conf will be ignored.

       VIA Technologies VT1622, VT1622A, VT1623
	      Supports	the following modes: "640x480", "800x600", "1024x768",
	      "848x480", "720x480" (NTSC only) and "720x576" (PAL only).   Use
	      "640x480Over",   "800x600Over",  "1024x768Over",	"848x480Over",
	      "720x480Over" (NTSC) and "720x576Over" (PAL) for vertical	 over‐
	      scan.   The  modes  "720x480Noscale" (NTSC) and "720x576Noscale"
	      (PAL) (available on  VT1622  only)  provide  cleaner  TV	output
	      (unscaled	 with  only  minimal  overscan).  These modes are made
	      available by the driver; modelines provided in xorg.conf will be

       Xorg(1), xorg.conf(5), Xserver(1), X(7), EXA(5), Xv(5)

       Authors include: ...

X Version 11		  xf86-video-openchrome 0.3.0		 OPENCHROME(4)

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