236 lines
11 KiB
Groff
236 lines
11 KiB
Groff
.\" Shorthand for double quote that works everywhere,
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.\" also within other double quotes:
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.ds q \N'34'
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.TH OPENCHROME __drivermansuffix__ __vendorversion__
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.SH NAME
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openchrome \- video driver for VIA Unichromes
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.SH SYNOPSIS
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.nf
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.B "Section \*qDevice\*q"
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.BI " Identifier \*q" string \*q
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.B " Driver \*qopenchrome\*q"
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\ \ ...
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.B EndSection
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.fi
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.SH DESCRIPTION
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.B openchrome
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is an __xservername__ driver for VIA chipsets that have an integrated
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Unichrome graphics engine.
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.PP
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The
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.B openchrome
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driver supports the following chipsets: CLE266, KM400/KN400, CN400, CN700,
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K8M800/K8N800, PM800/PN800, P4M800Pro, VN800, PM880, K8M890/K8N890,
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CN896, VN896, and P4M900.
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The driver includes 2D acceleration and Xv video overlay extensions.
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Flat panel, TV, and VGA outputs are supported, depending on the hardware
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configuration.
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.PP
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3D direct rendering is available using experimental drivers from Mesa
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(www.mesa3d.org). There is also an XvMC client library for hardware
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acceleration of MPEG1/MPEG2 decoding (not available on the KM/N400)
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that uses the Direct Rendering Infrastructure (DRI).
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The XvMC client library implements a non-standard
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"VLD" extension to the XvMC standard. The current Direct Rendering
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Manager (DRM) kernel module is available at dri.sourceforge.net.
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.PP
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The driver supports free modes for Unichrome Pros (K8M800/K8N800, PM800/PN800,
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and CN400). For plain Unichromes (CLE266, KM400/KN400), it currently supports
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only a limited number of dotclocks, so if you are using X modelines you
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must make sure that the dotclock is one of those supported. Supported
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dotclocks on plain Unichromes are currently (in MHz): 25.2, 25.312,
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26.591, 31.5, 31.704, 32.663, 33.750, 35.5, 36.0, 39.822, 40.0, 41.164,
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46.981, 49.5, 50.0, 56.3, 57.284, 64.995, 65.0, 65.028, 74.480,
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75.0, 78.8, 81.613, 94.5, 108.0, 108.28, 122.0, 122.726, 135.0,
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148.5, 155.8, 157.5, 161.793, 162.0, 175.5, 189.0, 202.5, 204.8,
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218.3, 229.5. On top of this, bandwidth restrictions apply for both
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Unichromes and Unichrome Pros.
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.PP
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.SH CONFIGURATION DETAILS
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Please refer to __xconfigfile__(__filemansuffix__) for general configuration
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details. This section only covers configuration details specific to this
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driver.
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.PP
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The following driver
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.B options
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are supported:
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.TP
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.BI "Option \*qAccelMethod\*q \*q" string \*q
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The driver supports "XAA" and "EXA" acceleration methods. The default
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method is XAA, since EXA is still experimental. Contrary to XAA, EXA
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implements acceleration for screen uploads and downlads (if DRI is
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enabled) and for the Render/Composite extension.
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.TP
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.BI "Option \*qActiveDevice\*q \*q" string \*q
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Specifies the active device combination. Any string containing "CRT",
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"LCD", "DFP", "TV" should be possible. "CRT" represents anything that
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is connected to the VGA port, "LCD" and "DFP" are for laptop panels
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(not TFT screens attached to the VGA port), "TV" is self-explanatory.
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The default is to use what is detected. The driver is currently unable
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to use LCD and TV simultaneously, and will favour the LCD.
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.TP
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.BI "Option \*qAGPMem\*q \*q" integer \*q
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Sets the amount of AGP memory that is allocated at X server startup.
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The allocated memory will be "integer" kB. This AGP memory is used for
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the AGP command buffer (if the option "EnableAGPDMA" is set to "true"), for
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DRI textures, and for the EXA scratch area. The driver will allocate at
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least one system page of AGP memory, or \-\- if the AGP command buffer is
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used \-\- at least 2 MB plus one system page. If there is no room for the
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EXA scratch area in AGP space, it will be allocated from VRAM. If there is
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no room for DRI textures, they will be allocated from the DRI part of
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VRAM (see the option "MaxDRIMem"). The default amount of AGP is
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32768 kB. Note that the AGP aperture set in the BIOS must be able
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to accomodate the amount of AGP memory specified here. Otherwise no
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AGP memory will be available. It is safe to set a very large AGP
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aperture in the BIOS.
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.TP
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.BI "Option \*qCenter\*q \*q" boolean \*q
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Enables image centering on DVI displays. The default is disabled.
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.TP
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.BI "Option \*qDisableIRQ\*q \*q" boolean \*q
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Disables the vertical blank IRQ. This is a workaround for some mainboards
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that have problems with IRQs coming from the Unichrome engine. With IRQs
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disabled, DRI clients have no way to synchronize their drawing to Vblank.
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(IRQ is disabled by default on the KM400 and K8M800 chipsets.)
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.TP
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.BI "Option \*qDisableVQ\*q \*q" boolean \*q
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Disables the use of the virtual command queue. The queue is enabled
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by default.
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.TP
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.BI "Option \*qEnableAGPDMA\*q \*q" boolean \*q
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Enables the AGP DMA functionality in DRM. This requires that DRI is enabled
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and will force 2D and 3D acceleration to use AGP DMA. The XvMC DRI
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client will also make use of this on the CLE266 to consume much less CPU.
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(This option is enabled by default, except on the K8M890 and P4M900.)
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.TP
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.BI "Option \*qExaNoComposite\*q \*q" boolean \*q
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If EXA is enabled (using the option "AccelMethod"), this option enables
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acceleration of compositing. Since EXA, and in particular its composite
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acceleration, is still experimental, this is a way to disable a misbehaving
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composite acceleration.
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.TP
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.BI "Option \*qExaScratchSize\*q \*q" integer \*q
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Sets the size of the EXA scratch area to "integer" kB. This area is
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used by EXA as a last place to look for available space for pixmaps.
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Too little space will slow compositing down. This option should be set
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to the size of the largest pixmap used. If you have a screen width of
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over 1024 pixels and use 24 bpp, set this to 8192. Otherwise you can
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leave this at the default 4096. The space will be allocated from AGP
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memory if available, otherwise from VRAM.
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.TP
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.BI "Option \*qLCDDualEdge\*q \*q" boolean \*q
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Enables the use of dual-edge mode to set the LCD. The default is disabled.
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.TP
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.BI "Option \*qMaxDRIMem\*q \*q" integer \*q
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Sets the maximum amount of VRAM memory allocated for DRI clients to
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"integer" kB. Normally DRI clients get half the available VRAM size,
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but in some cases it may make sense to limit this amount. For example,
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if you are using a composite manager and you want to give as much memory
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as possible to the EXA pixmap storage area.
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.TP
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.BI "Option \*qMigrationHeuristic\*q \*q" string \*q
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Sets the heuristic for EXA pixmap migration. This is an EXA core
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option, and on Xorg server versions after 1.1.0 this defaults to
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"smart". The openchrome driver performs best with "greedy", so you
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should really add this option to your configuration file. The third
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possibility is "always", which might become more useful in the future.
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.TP
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.BI "Option \*qNoAccel\*q \*q" boolean \*q
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Disables the use of hardware acceleration. Acceleration is enabled
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by default.
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.TP
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.BI "Option \*qNoAGPFor2D\*q \*q" boolean \*q
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Disables the use of AGP DMA for 2D acceleration, even when AGP DMA is
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enabled. The default is enabled.
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.TP
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.BI "Option \*qNoXVDMA\*q \*q" boolean \*q
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If DRI is enabled, Xv normally uses PCI DMA to transfer video images
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from system to frame-buffer memory. This is somewhat slower than
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direct copies due to the limitations of the PCI bus, but on the other
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hand it decreases CPU usage significantly, particularly on computers
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with fast processors. Some video players are buggy and will display
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rendering artifacts when PCI DMA is used. If you experience this,
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or don't want your PCI bus to be stressed with Xv images, set this
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option to "true". This option has no effect when DRI is not enabled.
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.TP
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.BI "Option \*qPanelSize\*q \*q" string \*q
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Specifies the size (width x height) of the LCD panel attached to the
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system. The sizes 640x480, 800x600, 1024x768, 1280x1024, and 1400x1050
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are supported.
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.TP
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.BI "Option \*qRotate\*q \*q" string \*q
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Rotates the display either clockwise ("CW") or counterclockwise ("CCW").
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Rotation is only supported unaccelerated.
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.TP
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.BI "Option \*qShadowFB\*q \*q" boolean \*q
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Enables the use of a shadow frame buffer. This is required when
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rotating the display, but otherwise defaults to disabled.
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.TP
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.BI "Option \*qSWCursor\*q \*q" boolean \*q
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Enables the use of a software cursor. The default is disabled:
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the hardware cursor is used.
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.TP
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.BI "Option \*qTVDeflicker\*q \*q" integer \*q
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Specifies the deflicker setting for TV output. Valid values are "0", "1",
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and "2". Here 0 means no deflicker, 1 means 1:1:1 deflicker, and 2 means
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1:2:1 deflicker.
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.TP
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.BI "Option \*qTVDotCrawl\*q \*q" boolean \*q
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Enables dot-crawl suppression. The default is disabled.
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.TP
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.BI "Option \*qTVOutput\*q \*q" string \*q
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Specifies which TV output to use. The driver supports "S-Video",
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"Composite", "SC", "RGB", and "YCbCr" outputs. Note that on some
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EPIA boards the composite-video port is shared with audio-out and
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is selected via a jumper.
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.TP
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.BI "Option \*qTVType\*q \*q" string \*q
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Specifies TV output format. The driver currently supports "NTSC" and
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"PAL" timings only.
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.TP
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.BI "Option \*qVBEModes\*q \*q" boolean \*q
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Enables the use of VBE BIOS calls for setting the display mode. This mimics
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the behaviour of the vesa driver but still provides acceleration and
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other features. This option may be used if your hardware works with
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the vesa driver but not with the openchrome driver. It may not work
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on 64-bit systems. Using "VBEModes" may speed up driver acceleration
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significantly due to a more aggressive hardware setting, particularly
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on systems with low memory bandwidth. Your refresh rate may be limited
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to 60 Hz on some systems.
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.TP
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.BI "Option \*qVBESaveRestore\*q \*q" boolean \*q
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Enables the use of VBE BIOS calls for saving and restoring the display state
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when the X server is launched. This can be extremely slow on some hardware,
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and the system may appear to have locked for 10 seconds or so. The default
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is to use the driver builtin function. This option only works if option
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"VBEModes" is enabled.
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.TP
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.BI "Option \*qVideoRAM\*q \*q" integer \*q
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Overrides the VideoRAM autodetection. This should never be needed.
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.PP
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.SH "TV ENCODERS"
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Unichromes tend to be paired with several different TV encoders.
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.TP
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.BI "VIA Technologies VT1621"
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Still untested, as no combination with a Unichrome is known or available.
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Supports the following normal modes: "640x480" and "800x600". Use
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"640x480Over" and "800x600Over" for vertical overscan. These modes
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are made available by the driver; modelines provided in __xconfigfile__
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will be ignored.
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.TP
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.BI "VIA Technologies VT1622, VT1622A, VT1623"
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Supports the following modes: "640x480", "800x600", "1024x768",
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"848x480", "720x480" (NTSC only) and "720x576" (PAL only). Use
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"640x480Over", "800x600Over", "1024x768Over", "848x480Over",
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"720x480Over" (NTSC) and "720x576Over" (PAL) for vertical overscan.
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The modes "720x480Noscale" (NTSC) and "720x576Noscale" (PAL) (available
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on VT1622 only) provide cleaner TV output (unscaled with only minimal
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overscan). These modes are made available by the driver; modelines
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provided in __xconfigfile__ will be ignored.
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.SH "SEE ALSO"
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__xservername__(__appmansuffix__), __xconfigfile__(__filemansuffix__), xorgconfig(__appmansuffix__), Xserver(__appmansuffix__), X(__miscmansuffix__)
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.SH AUTHORS
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Authors include: ...
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