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Enable or disable TwinView. Please see Appendix G, Configuring TwinView for details. Default: off (TwinView is disabled).
Option "TwinViewOrientation" "string"
Controls the relationship between the two display devices when using TwinView. Takes one of the following values: "RightOf" "LeftOf" "Above" "Below" "Clone". Please see Appendix G, Configuring TwinView for details. Default: string is NULL.
Option "SecondMonitorHorizSync" "range(s)"
This option is like the HorizSync entry in the Monitor section, but is for the second monitor when using TwinView. Please see Appendix G, Configuring TwinView for details. Default: none.
Option "SecondMonitorVertRefresh" "range(s)"
This option is like the VertRefresh entry in the Monitor section, but is for the second monitor when using TwinView. Please see Appendix G, Configuring TwinView for details. Default: none.
Option "MetaModes" "string"
This option describes the combination of modes to use on each monitor when using TwinView. Please see Appendix G, Configuring TwinView for details. Default: string is NULL.
Option "NoTwinViewXineramaInfo" "boolean"
When in TwinView, the NVIDIA X driver normally provides a Xinerama extension that X clients (such as window managers) can use to discover the current TwinView configuration. Some window mangers get confused by this information, so this option is provided to disable this behavior. Default: false (TwinView Xinerama information is provided).
Option "TVStandard" "string"
Please see Appendix H, Configuring TV-Out for details on configuring TV-out.
Option "TVOutFormat" "string"
Please see Appendix H, Configuring TV-Out for details on configuring TV-out.
Option "TVOverScan" "Decimal value in the range 0.0 to 1.0"
Valid values are in the range 0.0 through 1.0; Please see Appendix H, Configuring TV-Out for details on configuring TV-out.
Option "Stereo" "integer"
Enable offering of quad-buffered stereo visuals on Quadro. Integer indicates the type of stereo equipment being used:
Value Equipment
1 DDC glasses. The sync signal is sent to the glasses via the DDC signal to the monitor. These usually involve a passthrough cable between the monitor and video card.
2 "Blueline" glasses. These usually involve a passthrough cable between the monitor and video card. The glasses know which eye to display based on the length of a blue line visible at the bottom of the screen. When in this mode, the root window dimensions are one pixel shorter in the Y dimension than requested. This mode does not work with virtual root window sizes larger than the visible root window size (desktop panning).
3 Onboard stereo support. This is usually only found on professional cards. The glasses connect via a DIN connector on the back of the video card.
4 TwinView clone mode stereo (aka "passive" stereo). On video cards that support TwinView, the left eye is displayed on the first display, and the right eye is displayed on the second display. This is normally used in conjunction with special projectors to produce 2 polarized images which are then viewed with polarized glasses. To use this stereo mode, you must also configure TwinView in clone mode with the same resolution, panning offset, and panning domains on each display.
5 Vertical interlaced stereo mode, for use with SeeReal Stereo Digital Flat Panels.
6 Color interleaved stereo mode, for use with Sharp3D Stereo Digital Flat Panels.
Stereo is only available on Quadro cards. Stereo options 1, 2, and 3 (aka "active" stereo) may be used with TwinView if all modes within each metamode have identical timing values. Please see Appendix J, Programming Modes for suggestions on making sure the modes within your metamodes are identical. The identical modeline requirement is not necessary for Stereo option 4 ("passive" stereo). Currently, stereo operation may be "quirky" on the original Quadro (NV10) chip and left-right flipping may be erratic. We are trying to resolve this issue for a future release. Default: 0 (Stereo is not enabled).
UBB must be enabled when stereo is enabled (this is the default behavior).
Stereo options 1, 2, and 3 (aka "active" stereo) are not supported on digital flat panels.
Option "AllowDFPStereo" "boolean"
By default, the NVIDIA X driver performs a check which disables active stereo (stereo options 1, 2, and 3) if the X screen is driving a DFP. The "AllowDFPStereo" option bypasses this check.
Option "ForceStereoFlipping" "boolean"
Stereo flipping is the process by which left and right eyes are displayed on alternating vertical refreshes. Normally, stereo flipping is only performed when a stereo drawable is visible. This option forces stereo flipping even when no stereo drawables are visible.
This is to be used in conjunction with the "Stereo" option. If "Stereo" is 0, the "ForceStereoFlipping" option has no effect. If otherwise, the "ForceStereoFlipping" option will force the behavior indicated by the "Stereo" option, even if no stereo drawables are visible. This option is useful in a multiple-screen environment in which a stereo application is run on a different screen than the stereo master.
Possible values:
Value Behavior
0 Stereo flipping is not forced. The default behavior as indicated by the "Stereo" option is used.
1 Stereo flipping is forced. Stereo is running even if no stereo drawables are visible. The stereo mode depends on the value of the "Stereo" option.
Default: 0 (Stereo flipping is not forced). Note that active stereo is not supported on digital flat panels.
Option "XineramaStereoFlipping" "boolean"
By default, when using Stereo with Xinerama, all physical X screens having a visible stereo drawable will stereo flip. Use this option to allow only one physical X screen to stereo flip at a time.
This is to be used in conjunction with the "Stereo" and "Xinerama" options. If "Stereo" is 0 or "Xinerama" is 0, the "XineramaStereoFlipping" option has no effect.
If you wish to have all X screens stereo flip all the time, please see the "ForceStereoFlipping" option.
Possible values:
Value Behavior
0 Stereo flipping is enabled on one X screen at a time. Stereo is enabled on the first X screen having the stereo drawable.
1 Stereo flipping in enabled on all X screens.
Default: 1 (Stereo flipping is enabled on all X screens).
Option "NoBandWidthTest" "boolean"
As part of mode validation, the X driver tests if a given mode fits within the hardware's memory bandwidth constraints. This option disables this test. Default: false (the memory bandwidth test is performed).
Option "IgnoreDisplayDevices" "string"
This option tells the NVIDIA kernel module to completely ignore the indicated classes of display devices when checking what display devices are connected. You may specify a comma-separated list containing any of "CRT", "DFP", and "TV". For example:
Option "IgnoreDisplayDevices" "DFP, TV"
will cause the NVIDIA driver to not attempt to detect if any digital flat panels or TVs are connected. This option is not normally necessary; however, some video BIOSes contain incorrect information about what display devices may be connected, or what i2c port should be used for detection. These errors can cause long delays in starting X. If you are experiencing such delays, you may be able to avoid this by telling the NVIDIA driver to ignore display devices which you know are not connected. NOTE: anything attached to a 15 pin VGA connector is regarded by the driver as a CRT. "DFP" should only be used to refer to digital flat panels connected via a DVI port.
Option "MultisampleCompatibility" "boolean"
Enable or disable the use of separate front and back multisample buffers. Enabling this will consume more memory but is necessary for correct output when rendering to both the front and back buffers of a multisample or FSAA drawable. This option is necessary for correct operation of SoftImage XSI. Default: false (a single multisample buffer is shared between the front and back buffers).
Option "NoPowerConnectorCheck" "boolean"
The NVIDIA X driver will abort X server initialization if it detects that a GPU that requires an external power connector does not have an external power connector plugged in. This option can be used to bypass this test. Default: false (the power connector test is performed).
Option "XvmcUsesTextures" "boolean"
Forces XvMC to use the 3D engine for XvMCPutSurface requests rather than the video overlay. Default: false (video overlay is used when available).
Option "AllowGLXWithComposite" "boolean"
Enables GLX even when the Composite X extension is loaded. ENABLE AT YOUR OWN RISK. OpenGL applications will not display correctly in many circumstances with this setting enabled. Default: false (GLX is disabled when Composite is loaded).
Option "ExactModeTimingsDVI" "boolean"
Forces the initialization of the X server with the exact timings specified in the ModeLine. Default: false (for DVI devices, the X server initializes with the closest mode in the EDID list).
Option "Coolbits" "integer"
Enables support in the NV-CONTROL X extension for manipulating GPU clock settings. When this option is set to "1" the nvidia-settings utility will contain a page labeled "Clock Frequencies" through which clock settings can be manipulated. Coolbits is only available on GeForce FX, Quadro FX, and newer GPUs. Default 0 (support is disabled).
WARNING: this may cause system damage and void warranties. This utility can run your computer system out of the manufacturer's design specifications, including, but not limited to: higher system voltages, above normal temperatures, excessive frequencies, and changes to BIOS that may corrupt the BIOS. Your computer's operating system may hang and result in data loss or corrupted images. Depending on the manufacturer of your computer system, the computer system, hardware and software warranties may be voided, and you may not receive any further manufacturer support. NVIDIA does not provide customer service support for the Coolbits option. It is for these reasons that absolutely no warranty or guarantee is either express or implied. Before enabling and using, you should determine the suitability of the utility for your intended use, and you shall assume all responsibility in connection therewith.
Option "SLI" "string"
This option controls the configuration of SLI rendering in supported configurations.
Value Behavior
0, no, off, false, Single Use only a single GPU when rendering
1, yes, on, true, Auto Enable SLI and allow the driver to automatically select the appropriate rendering mode.
AFR Enable SLI and use the alternate frame rendering mode.
SFR Enable SLI and use the split frame rendering mode.
SLIAA Enable SLI and use SLI antialiasing. Use this in conjunction with full scene antialiasing to improve visual quality.
Option "DPI" "string"
This option specifies the Dots Per Inch for the X screen; for example:
Option "DPI" "75 x 85"
will set the horizontal DPI to 75 and the vertical DPI to 85. By default, the X driver will compute the DPI of the X screen from the EDID of any connected display devices. See Appendix Y, Dots Per Inch for details. Default: string is NULL (disabled).
Option "UseEdidDpi" "string"
By default, the NVIDIA X driver computes the DPI of an X screen based on the physical size of the display device, as reported in the EDID. If multiple display devices are used by the X screen, then the NVIDIA X screen will choose which display device to use. This option can be used to specify which display device to use. The string argument can be a display device name, such as:
Option "UseEdidDpi" "DFP-0"
or the argument can be "FALSE" to disable use of EDID-based DPI calculations:
Option "UseEdidDpi" "FALSE"
See Appendix Y, Dots Per Inch for details. Default: string is NULL (the driver computes the DPI from the EDID of a display device and selects the display device).
Option "LoadKernelModule" "boolean"
Normally, the NVIDIA Linux X driver module will attempt to load the NVIDIA Linux kernel module. Set this option to "off" to disable automatic loading of the NVIDIA kernel module by the NVIDIA X driver. Default: on (the driver loads the kernel module).
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