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The default value is
.B undefined.
.TP 
.BI "Option \*qCRT2HSync\*q \*q" "string" \*q
Set the horizontal sync range for the secondary  monitor. 
It is not required if a DDC\-capable monitor is connected.
.br
For example, Option "CRT2HSync" "30.0-86.0"
.br
The default value is
.B undefined.
.TP 
.BI "Option \*qCRT2VRefresh\*q \*q" "string" \*q
Set the vertical refresh range for the secondary monitor.
It is not required if a DDC\-capable monitor is connected.
.br
For example, Option "CRT2VRefresh" "50.0-120.0"
.br
The default value is
.B undefined.
.TP
.BI "Option \*qCRT2Position\*q \*q" "string" \*q
Set the relationship of CRT2 relative to CRT1. Valid options are: 
.B Clone
,
.B LeftOf
,
.B RightOf
,
.B Above
, and
.B Below
.
.br
For example, Option "CRT2Position" "RightOf"
.br
This option also supports an offset.  This is most useful when
.B MergedNonRectangular 
is enabled.  For example if you want CRT2 to be offset 100 pixels down from 
the start of CRT1, you'd type:
.br
Option "CRT2Position" "LeftOf 100"
.br
The offset is vertical for LeftOf and RightOf and horizontal for Above and 
Below.  Offsets can be positive or negative.
.br
The default value is
.B Clone.
.TP
.BI "Option \*qMetaModes\*q \*q" "string" \*q
MetaModes are mode combinations for CRT1 and CRT2.  If you are using merged
frame buffer mode and want to change modes (CTRL-ALT-+/-), these define which
modes will be switched to on CRT1 and CRT2.  The MetaModes are defined as 
CRT1Mode-CRT2Mode (800x600-1024x768).  Modes listed individually (800x600) 
define clone modes, that way you can mix clone modes with non-clone modes. 
Also some programs require "standard" modes.  If you want to add clone modes 
of different refreshes or sizes to the mix, they are defined as CRT1Mode+CRT2Mode 
(800x600+1024x768).
.br
Note:  Any mode you use in the MetaModes must be defined in the
.B Screen 
section of your __xconfigfile__ file.  Modes not defined there will be ignored when
the MetaModes are parsed since the driver uses them to make sure the monitors can 
handle those modes.  If you do not define a MetaMode the driver will create
one based on the orientation of the heads and size of the largest defined mode in 
the display section that is supported on each head.
.br
.B Modes "1024x768" "800x600" "640x480"
.br
For example, Option "MetaModes" "1024x768-1024x768 800x600-1024x768 640x480-800x600 800x600"
.br
The default value is
.B undefined.
.TP
.BI "Option \*qMergedXinerama\*q \*q" boolean \*q
Since merged framebuffer mode does not use Xinerama, apps are not able to intelligently
place windows.  Merged framebuffer mode provides its own pseudo-Xinerama.  This allows
Xinerama compliant applications to place windows appropriately.  There are some caveats.
Since merged framebuffer mode is able to change relative screen sizes and orientations on
the fly, as well has having overlapping viewports, pseudo-Xinerama, might not always 
provide the right hints.  Also many Xinerama compliant applications only query Xinerama
once at startup; if the information changes, they may not be aware of the change.  If
you are already using Xinerama (e.g., a single head card and a dualhead card providing
three heads), pseudo-Xinerama will be disabled.
.br
This option allows you turn off the driver provided pseudo-Xinerama extension.
.br
The default value is
.B TRUE.
.TP 
.BI "Option \*qMergedXineramaCRT2IsScreen0\*q \*q" boolean \*q
By default the pseudo-Xinerama provided by the driver makes the left-most or bottom
head Xinerama screen 0.  Certain Xinerama-aware applications do special things with 
screen 0.  To change that behavior, use this option.
.br
The default value is
.B undefined.
.TP
.BI "Option \*qMergedDPI\*q \*q" "string" \*q
The driver will attempt to figure out an appropriate DPI based on the DDC information
and the orientation of the heads when in merged framebuffer mode.  If this value does 
not suit you, you can manually set the DPI using this option.
.br
For example, Option "MergedDPI" "100 100"
.br
The default value is
.B undefined.
.TP
.BI "Option \*qMergedNonRectangular\*q \*q" boolean \*q
If you are using MergedFB with two modes of different sizes, turn this option on to 
keep the smaller head from scrolling within the larger virtual desktop and to keep 
the mouse from moving into that area.  Applications that are not Xinerama aware can 
potentially end up stranded in this area.
.br
The default value is
.B FALSE.
.TP
.BI "Option \*qColorTiling\*q \*q" "boolean" \*q
Frame buffer can be addressed either in linear or tiled mode. Tiled mode can provide
significant performance benefits with 3D applications, for 2D it shouldn't matter
much. Tiling will be disabled if the virtual x resolution exceeds 2048 (3968 for R300 
and above), if option
.B UseFBDev
is used, or (if DRI is enabled) the drm module is too old.
.br
If this option is enabled, a new dri driver is required for direct rendering too.
.br
Color tiling will be automatically disabled in interlaced or doublescan screen modes.
.br
The default value is
.B on.
.TP 
.BI "Option \*qIgnoreEDID\*q \*q" boolean \*q
Do not use EDID data for mode validation, but DDC is still used
for monitor detection. This is different from NoDDC option.
.br
The default value is
.B off.
.TP 
.BI "Option \*qPanelSize\*q \*q" "string" \*q
Should only be used when driver cannot detect the correct panel size.
Apply to both desktop (TMDS) and laptop (LVDS) digital panels.
When a valid panel size is specified, the timings collected from
DDC and BIOS will not be used. If you have a panel with timings 
different from that of a standard VESA mode, you have to provide
this information through the Modeline.
.br
For example, Option "PanelSize" "1400x1050"
.br
The default value is
.B none.
.TP 
.BI "Option \*qPanelOff\*q \*q" boolean \*q
Disable panel output.
.br
The default value is
.B off.
.TP
.BI "Option \*qEnablePageFlip\*q \*q" boolean \*q
Enable page flipping for 3D acceleration. This will increase performance
but not work correctly in some rare cases, hence the default is
.B off.
.TP
.BI "Option \*qForceMinDotClock\*q \*q" frequency \*q
Override minimum dot clock. Some Radeon BIOSes report a minimum dot
clock unsuitable (too high) for use with television sets even when they
actually can produce lower dot clocks. If this is the case you can
override the value here.
.B Note that using this option may damage your hardware.
You have been warned. The
.B frequency
parameter may be specified as a float value with standard suffixes like
"k", "kHz", "M", "MHz".
.TP
.BI "Option \*qRenderAccel\*q \*q" boolean \*q
Enables or disables hardware Render acceleration.  This driver does not
support component alpha (subpixel) rendering.  It is only supported on
Radeon series up to and including 9200 (9500/9700 and newer
unsupported).  The default is to
.B enable
Render acceleration.
.TP
.BI "Option \*qAccelMethod\*q \*q" "string" \*q
Chooses between available acceleration architectures.  Valid options are
.B XAA
and
.B EXA.
XAA is the traditional acceleration architecture and support for it is very
stable.  EXA is a newer acceleration architecture with better performance for
the Render and Composite extensions, but the rendering code for it is newer and
possibly unstable.  The default is
.B XAA.
.TP
.BI "Option \*qAccelDFS\*q \*q" boolean \*q
Use or don't use accelerated EXA DownloadFromScreen hook when possible (only
when Direct Rendering is enabled, e.g.).
Default:
.B off
with AGP due to issues with GPU->host transfers with some AGP bridges,
.B on
otherwise.
.TP
.BI "Option \*qFBTexPercent\*q \*q" integer \*q
Amount of video RAM to reserve for OpenGL textures, in percent. With EXA, the
remainder of video RAM is reserved for EXA offscreen management. Specifying 0
results in all offscreen video RAM being reserved for EXA and only GART memory
being available for OpenGL textures. This may improve EXA performance, but
beware that it may cause problems with OpenGL drivers from Mesa versions older
than 6.4. With XAA, specifiying lower percentage than what gets reserved without
this option has no effect, but the driver tries to increase the video RAM
reserved for textures to the amount specified roughly.
Default:
.B 50.
.TP
.BI "Option \*qDepthBits\*q \*q" integer \*q
Precision in bits per pixel of the shared depth buffer used for 3D acceleration.
Valid values are 16 and 24. When this is 24, there will also be a hardware
accelerated stencil buffer, but the combined depth/stencil buffer will take up
twice as much video RAM as when it's 16.
Default:
.B The same as the screen depth.
.TP
.BI "Option \*qDMAForXv\*q \*q" boolean \*q
Try or don't try to use DMA for Xv image transfers. This will reduce CPU
usage when playing big videos like DVDs, but may cause instabilities.
Default:
.B on.
.TP
.BI "Option \*qSubPixelOrder\*q \*q" "string" \*q
Force subpixel order to specified order.
Subpixel order is used for subpixel decimation on flat panels.
.br
NONE   \-\- No subpixel (CRT like displays)
.br
RGB    \-\- in horizontal RGB order (most flat panels)
.br
BGR    \-\- in horizontal BGR order (some flat panels)

.br
This option is intended to be used in following cases:
.br
1. The default subpixel order is incorrect for your panel.
.br
2. Enable subpixel decimation on analog panels.
.br
3. Adjust to one display type in dual-head clone mode setup.
.br
4. Get better performance with Render acceleration on 
digital panels (use NONE setting).
.br
The default is 
.B NONE 
for CRT, 
.B RGB 
for digital panels
.TP
.BI "Option \*qDynamicClocks\*q \*q" boolean \*q
Enable dynamic clock scaling.  The on-chip clocks will scale dynamically 
based on usage. This can help reduce heat and increase battery 
life by reducing power usage.  Some users report reduced 3D performance
with this enabled.  The default is
.B off.
.TP
.BI "Option \*qBIOSHotkeys\*q \*q" boolean \*q
Enable BIOS hotkey output switching. This allows the BIOS to toggle outputs
using hotkeys (e.g., fn-f7, etc.).  Since the driver does not support ACPI, 
there is no way to validate modes on an output switch and the BIOS can 
potentially change things behind the driver's back.  The default is
.B off.
.TP
.BI "Option \*qVGAAccess\*q \*q" boolean \*q
Tell the driver if it can do legacy VGA IOs to the card. This is
necessary for properly resuming consoles when in VGA text mode, but
shouldn't be if the console is using radeonfb or some other graphic
mode driver. Some platforms like PowerPC have issues with those, and they aren't
necessary unless you have a real text mode in console. The default is
.B off
on PowerPC and
.B on
on other architectures.
.TP
.BI "Option \*qReverseDDC\*q \*q" boolean \*q
When BIOS connector informations aren't available, use this option to
reverse the mapping of the 2 main DDC ports. Use this if the X serve
obviously detects the wrong display for each connector. This is
typically needed on the Radeon 9600 cards bundled with Apple G5s. The
default is
.B off.
.TP
.BI "Option \*qLVDSProbePLL\*q \*q" boolean \*q
When BIOS panel informations aren't available (like on PowerBooks), it
may still be necessary to use the firmware provided PLL values for the
panel or flickering will happen. This option will force probing of
the current value programmed in the chip when X is launched in that
case.  This is only useful for LVDS panels (laptop internal panels).
The default is
.B on.
.TP

.SH SEE ALSO
__xservername__(__appmansuffix__), __xconfigfile__(__filemansuffix__), xorgconfig(__appmansuffix__), Xserver(__appmansuffix__), X(__miscmansuffix__)
.SH AUTHORS
.nf
Authors include:
Rickard E. (Rik) Faith   \[e-mail]\fP
Kevin E. Martin          \[e-mail]\fP
Alan Hourihane           \[e-mail]\fP
Marc Aurele La France    \[e-mail]\fP
Benjamin Herrenschmidt   \[e-mail]\fP
Michel D盲nzer            \[e-mail]\fP
Alex Deucher             \[e-mail]\fP
Bogdan D.                \[e-mail]\fP
Eric Anholt              \[e-mail]\fP