Table of Contents
radeon - ATI RADEON video driver
radeon is an Xorg driver for ATI RADEON based video cards with
the following features:
radeon driver supports PCI, AGP, and PCIE video cards based on the following
- Full support for 8, 15, 16 and 24 bit pixel depths;
- RandR 1.2 and RandR 1.3 support;
- TV-out support (only on R/RV/RS1xx, R/RV/RS2xx,
R/RV/RS3xx. Experimental support on R/RV5xx, R/RV6xx, and R/RV7xx through
the ATOMTvOut option);
- Full EXA 2D acceleration;
- Full XAA 2D acceleration
(only on R/RV/RS1xx, R/RV/RS2xx, R/RV/RS3xx, R/RV/RS4xx, R/RV5xx, RS6xx.
XAA Render acceleration supported only on R/RV100, R/RV/RS2xx and RS3xx);
- Textured XVideo acceleration including anti-tearing support (Bicubic filtering
only available on R/RV3xx, R/RV/RS4xx, R/RV5xx, and RS6xx);
- Overlay XVideo
acceleration (only on R/RV/RS1xx, R/RV/RS2xx, R/RV/RS3xx, R/RV/RS4xx);
- 3D acceleration (not supported on R/RV6xx and R/RV/RS7xx);
Please refer to xorg.conf(5)
for general configuration
details. This section only covers configuration details specific to this
- Radeon 7200
- Radeon 7000(VE), M6, RN50/ES1000
- Radeon IGP320(M)
- Radeon 7500, M7, FireGL 7800
- Radeon IGP330(M)/IGP340(M)
- Radeon Mobility 7000 IGP
- Radeon 8500, 9100, FireGL 8800/8700
- Radeon 9000PRO/9000, M9
- Radeon 9200PRO/9200/9200SE/9250, M9+
- Radeon 9100 IGP
- Radeon 9200 IGP
- Radeon XPRESS 200(M)/1100
- Radeon 9700PRO/9700/9500PRO/9500/9600TX, FireGL X1/Z1
9800PRO/9800SE/9800, FireGL X2
- Radeon 9800XT
- Radeon 9600PRO/9600SE/9600/9550,
M10/M11, FireGL T2
- Radeon 9600XT
- Radeon X300, M22
- Radeon X700, M26 PCIE
- Radeon X800 AGP
X800, M28 PCIE
- Radeon X850 PCIE/AGP
- Radeon X1800
- Radeon X1600/X1650/X1700
- Radeon X1900/X1950
- Radeon X1200/X1250/X2100
- Radeon HD 2900
- Radeon HD 2400/2600
- Radeon HD 3850/3870
- Radeon HD 3100/3200/3300
- Radeon HD 4350/4550
- Radeon HD 4650/4670
- Radeon HD 4850/4870
The driver auto-detects all device information necessary to initialize
the card. However, if you have problems with auto-detection, you can specify:
VideoRam - in kilobytes
MemBase - physical address of the linear framebuffer
IOBase - physical address of the MMIO registers
ChipID - PCI DEVICE ID
In addition, the following driver Options are supported:
supports the following X11 Xv attributes for Textured Video. You can use
the "xvattr" tool to query/set those attributes at runtime.
- Option "SWcursor" "boolean"
- Selects software cursor. The default is off.
- Option "NoAccel" "boolean"
- Enables or disables all hardware acceleration.
The default is to enable hardware acceleration.
- Option "Dac6Bit" "boolean"
- Enables or disables the use of 6 bits per color component when in 8 bpp
mode (emulates VGA mode). By default, all 8 bits per color component are
The default is off.
- Option "VideoKey" "integer"
- This overrides the default
pixel value for the YUV video overlay key.
The default value is 0x1E.
- Option "ScalerWidth" "integer"
- This sets the
overlay scaler buffer width. Accepted values range from 1024 to 2048, divisible
by 64, values other than 1536 and 1920 may not make sense though. Should
be set automatically, but noone has a clue what the limit is for which
chip. If you think quality is not optimal when playing back HD video (with
horizontal resolution larger than this setting), increase this value, if
you get an empty area at the right (usually pink), decrease it. Note this
only affects the "true" overlay via xv, it won't affect things like textured
The default value is either 1536 (for most chips) or 1920.
- Option "AGPMode"
- Set AGP data transfer rate. (used only when DRI is enabled)
1 -- 1x (before AGP v3 only)
2 -- 2x (before AGP v3 only)
4 -- 4x
8 -- 8x (AGP v3 only)
others -- invalid
The default is to leave it unchanged.
- Option "AGPFastWrite" "boolean"
AGP fast writes. Enabling this is frequently the cause of instability. Used
only when the DRI is enabled. If you enable this option you will get *NO*
support from developers.
The default is off.
- Option "BusType" "string"
- Used to replace previous ForcePCIMode
option. Should only be used when driver's bus detection is incorrect or you
want to force a AGP card to PCI mode. Should NEVER force a PCI card to AGP
PCI -- PCI bus
AGP -- AGP bus
PCIE -- PCI Express bus
(used only when DRI is enabled)
The default is auto detect.
- Option "DisplayPriority" "string"
Used to prevent flickering or tearing problem caused by display buffer
AUTO -- Driver calculated (default).
BIOS -- Remain unchanged from BIOS setting. Use this if the calculation
is not correct
for your card.
HIGH -- Force to the highest priority. Use this if you have problem
with above options.
This may affect performance slightly.
The default value is AUTO.
- Option "ColorTiling" "boolean"
- 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), or if DRI is enabled the drm module is too old.
If this option is enabled, a new dri driver is required for direct rendering
Color tiling will be automatically disabled in interlaced or doublescan
The default value is on.
- Option "IgnoreEDID" "boolean"
- Do not use EDID data
for mode validation, but DDC is still used for monitor detection. This is
different from NoDDC option.
The default value is off.
- Option "CustomEDID" "string"
- Forces the X driver
to use the EDID data specified in a file rather than the display's EDID.
Also overrides DDC monitor detection.
You may specify a semicolon separated list of output name and filename
pairs with an optional flag, "digital" or "analog", to override the digital
bit in the edid which is used by the driver to determine whether to use
the analog or digital encoder associated with a DVI-I port. The output name
is the randr output name, e.g., "VGA-0" or "DVI-0"; consult the Xorg log for
the supported output names of any given system.
The file must contain a raw 128-byte EDID block, as captured by get-edid.
For example: Option "CustomEDID" "VGA-0:/tmp/edid1.bin; DVI-0:/tmp/edid2.bin:digital"
will assign the EDID from the file /tmp/edid1.bin to the output device VGA-0,
and the EDID from the file /tmp/edid2.bin to the output device DVI-0 and
force the DVI port to use the digital encoder.
Note that a output name must always be specified, even if only one EDID
Caution: Specifying an EDID that doesn't exactly match your display may
damage your hardware, as it allows the driver to specify timings beyond
the capabilities of your display. Use with care.
- Option "PanelSize" "string"
- 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.
For example, Option "PanelSize" "1400x1050"
The default value is none.
- Option "EnablePageFlip" "boolean"
- Enable page
flipping for 3D acceleration. This will increase performance but not work
correctly in some rare cases, hence the default is off. It is currently
only supported on R/RV/RS4xx and older hardware.
- Option "ForceMinDotClock"
- 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. Note that using this option may damage your hardware.
You have been warned. The frequency parameter may be specified as a float
value with standard suffixes like "k", "kHz", "M", "MHz".
- Option "RenderAccel"
- Enables or disables hardware Render acceleration. It is supported
on all Radeon cards when using EXA acceleration and on Radeon R/RV/RS1xx,
R/RV/RS2xx and RS3xx when usig XAA. The default is to enable Render acceleration.
- Option "AccelMethod" "string"
- Chooses between available acceleration architectures.
Valid options are XAA and 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. The default
- Option "AccelDFS" "boolean"
- Use or don't use accelerated EXA DownloadFromScreen
hook when possible (only when Direct Rendering is enabled, e.g.). Default:
off with AGP due to issues with GPU->host transfers with some AGP bridges,
- Option "FBTexPercent" "integer"
- 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, specifying 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: 50.
- Option "DepthBits"
- 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: The
same as the screen depth.
- Option "DMAForXv" "boolean"
- 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: on.
- Option "SubPixelOrder"
- Force subpixel order to specified order. Subpixel order is used
for subpixel decimation on flat panels.
NONE -- No subpixel (CRT like displays)
RGB -- in horizontal RGB order (most flat panels)
BGR -- in horizontal BGR order (some flat panels)
This option is intended to be used in following cases:
1. The default subpixel order is incorrect for your panel.
2. Enable subpixel decimation on analog panels.
3. Adjust to one display type in dual-head clone mode setup.
4. Get better performance with Render acceleration on digital panels (use
The default is NONE for CRT, RGB for digital panels
- Option "ClockGating"
- Enable dynamic clock gating. 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 off.
- Option "ForceLowPowerMode" "boolean"
- Enable a static low power mode. This can help reduce heat and increase
battery life by reducing power usage at the expense of performance. The
default is off.
- Option "DynamicPM" "boolean"
- Enable dynamic power mode switching.
This can help reduce heat and increase battery life by reducing power
usage when the system is idle (DPMS active). The default is off.
- Option "VGAAccess"
- 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 off
on PowerPC and SPARC and on on other architectures.
- Option "ReverseDDC"
- 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 server
obviously detects the wrong display for each connector. This is typically
needed on the Radeon 9600 cards bundled with Apple G5s. The default is off.
- Option "LVDSProbePLL" "boolean"
- 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 on.
- Option "TVDACLoadDetect" "boolean"
- Enable load detection
on the TV DAC. The TV DAC is used to drive both TV-out and analog monitors.
Load detection is often unreliable in the TV DAC so it is disabled by default.
The default is off.
- Option "DefaultTMDSPLL" "boolean"
- Use the default driver
provided TMDS PLL values rather than the ones provided by the bios. This
option has no effect on Mac cards. Enable this option if you are having
problems with a DVI monitor using the internal TMDS controller. The default
- Option "DefaultTVDACAdj" "boolean"
- Use the default driver provided
TVDAC Adj values rather than the ones provided by the bios. This option
has no effect on Mac cards. Enable this option if you are having problems
with a washed out display on the secondary DAC. The default is off.
- Enable DRI support. This option allows you to enable to
disable the DRI. The default is off for RN50/ES1000 and on for others.
- Option "DefaultConnectorTable" "boolean"
- Enable this option to skip the
BIOS connector table parsing and use the driver defaults for each chip.
The default is off
- Option "MacModel" "string"
Used to specify Mac models for connector tables and quirks. If you have
a powerbook or mini with DVI that does not work properly, try the alternate
options as Apple does not seem to provide a good way of knowing whether
they use internal or external TMDS for DVI. Only valid on PowerPC. On Linux,
the driver will attempt to detect the MacModel automatically.
ibook -- ibooks
powerbook-external -- Powerbooks with external DVI
powerbook-internal -- Powerbooks with integrated DVI
powerbook-vga -- Powerbooks with VGA rather than DVI
mini-external -- Mac Mini with external DVI
mini-internal -- Mac Mini with integrated DVI
imac-g5-isight -- iMac G5 iSight
emac -- eMac G4
The default value is undefined.
- Option "TVStandard" "string"
Used to specify the default TV standard if you want to use something other
than the bios default. Valid options are:
The default value is undefined.
- Option "ForceTVOut" "boolean"
- Enable this
option to force TV-out to always be detected as attached. The default is
- Option "IgnoreLidStatus" "boolean"
- Enable this option to ignore lid
status on laptops and always detect LVDS as attached. The default is on.
- Option "Int10" "boolean"
- This option allows you to disable int10 initialization.
Set this to False if you are experiencing a hang when initializing a secondary
card. The default is on.
- Option "EXAVSync" "boolean"
- This option attempts
to avoid tearing by stalling the engine until the display controller has
passed the destination region. It reduces tearing at the cost of performance
and has been know to cause instability on some chips. The default is off.
- Option "ATOMTvOut" "boolean"
- This option enables experimental TV-out support
for R/RV5xx, R/RV6xx, and R/RV7xx atombios chips. TV-out is experimental
and may not function on these chips as well as hoped for. The default is
- Option "R4xxATOM" "boolean"
- This option enables modesetting on R/RV4xx
chips using atombios. The default is off.
is used to control whether textured adapter synchronizes the screen update
to the monitor vertical refresh to eliminate tearing. It has two values:
'off'(0) and 'on'(1). The default is 'on'(1).
- XV_CRTC is used to control
which display controller (crtc) the textured adapter synchronizes the screen
update with when XV_VSYNC is enabled. The default, 'auto'(-1), will sync to
the display controller that more of the video is on. This attribute is
useful for things like clone mode where the user can best decide which
display should be synced. The default is 'auto'(-1).
is used to control whether textured adapter should apply a bicubic filter
to smooth the output. It has three values: 'off'(0), 'on'(1) and 'auto'(2). 'off'
means never apply the filter, 'on' means always apply the filter and 'auto'
means apply the filter only if the X and Y sizes are scaled to more than
double to avoid blurred output. Bicubic filtering is not currently compatible
with other Xv attributes like hue, contrast, and brightness, and must be
disabled to use those attributes. The default is 'auto'(2).
- Wiki page:
- Overview about radeon development code:
- Mailing list:
#radeon on irc.freenode.net
- IRC channel:
- Query the bugtracker for radeon bugs:
- Submit bugs & patches:
Rickard E. (Rik) Faith firstname.lastname@example.org
Kevin E. Martin email@example.com
Alan Hourihane firstname.lastname@example.org
Marc Aurele La France email@example.com
Benjamin Herrenschmidt firstname.lastname@example.org
Michel D:anzer email@example.com
Alex Deucher firstname.lastname@example.org
Bogdan D. email@example.com
Eric Anholt firstname.lastname@example.org