radeon - ATI RADEON video driver
radeon is an Xorg driver for ATI RADEON based video cards with the
o Full support for 8, 15, 16 and 24 bit pixel depths;
o RandR 1.2 and RandR 1.3 support;
o 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
o Full EXA 2D acceleration;
o 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);
o Textured XVideo acceleration including anti-tearing support (Bicubic
filtering only available on R/RV3xx, R/RV/RS4xx, R/RV5xx, and
o Overlay XVideo acceleration (only on R/RV/RS1xx, R/RV/RS2xx,
o 3D acceleration;
The radeon driver supports PCI, AGP, and PCIE video cards based on the
following ATI chips:
R100 Radeon 7200
RV100 Radeon 7000(VE), M6, RN50/ES1000
RS100 Radeon IGP320(M)
RV200 Radeon 7500, M7, FireGL 7800
RS200 Radeon IGP330(M)/IGP340(M)
RS250 Radeon Mobility 7000 IGP
R200 Radeon 8500, 9100, FireGL 8800/8700
RV250 Radeon 9000PRO/9000, M9
RV280 Radeon 9200PRO/9200/9200SE/9250, M9+
RS300 Radeon 9100 IGP
RS350 Radeon 9200 IGP
RS400/RS480 Radeon XPRESS 200(M)/1100 IGP
R300 Radeon 9700PRO/9700/9500PRO/9500/9600TX, FireGL X1/Z1
R350 Radeon 9800PRO/9800SE/9800, FireGL X2
R360 Radeon 9800XT
RV350 Radeon 9600PRO/9600SE/9600/9550, M10/M11, FireGL T2
RV360 Radeon 9600XT
RV370 Radeon X300, M22
RV380 Radeon X600, M24
RV410 Radeon X700, M26 PCIE
R420 Radeon X800 AGP
R423/R430 Radeon X800, M28 PCIE
R480/R481 Radeon X850 PCIE/AGP
R520 Radeon X1800
RV530/RV560 Radeon X1600/X1650/X1700
RV570/R580 Radeon X1900/X1950
R600 Radeon HD 2900
RV610/RV630 Radeon HD 2400/2600
RV620/RV635 Radeon HD 3450/3470
RV670 Radeon HD 3850/3870
RS780 Radeon HD 3100/3200/3300
RV710 Radeon HD 4350/4550
RV730 Radeon HD 4650/4670
RV770 Radeon HD 4850/4870
Please refer to xorg.conf(5) for general configuration details. This
section only covers configuration details specific to this driver.
The driver auto-detects all device information necessary to initialize
the card. However, if you have problems with auto-detection, you can
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:
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 used.
The default is off.
Option "VideoKey" "integer"
This overrides the default pixel value for the YUV video overlay
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 video.
The default value is either 1536 (for most chips) or 1920.
Option "AGPMode" "integer"
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"
Enable 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
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
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 too.
Color tiling will be automatically disabled in interlaced or
doublescan screen modes.
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
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
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 is specified.
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
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" "frequency"
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" "boolean"
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 is EXA.
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, on otherwise.
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" "integer"
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
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" "string"
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 NONE setting).
The default is NONE for CRT, RGB for digital panels
Option "ClockGating" "boolean"
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
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" "boolean"
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" "boolean"
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
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 is off.
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.
Option "DRI" "boolean"
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 off
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 off.
Option "R4xxATOM" "boolean"
This option enables modesetting on R/RV4xx chips using atombios.
The default is off.
Option "EXAPixmaps" "boolean"
(KMS Only) Under kernel modesetting to avoid thrashing pixmaps
in/out of VRAM on low memory cards, we use a heuristic based on
VRAM amount, to determine whether to allow EXA to use VRAM for
non-essential pixmaps. This option allows us to override the
heurisitc. The default is on with > 32MB VRAM, off with < 32MB.
Option "ZaphodHeads" "string"
Specify the randr output(s) to use with zaphod mode for a
particular driver instance. If you use this option you most use
this option for all instances of the driver.
For example: Option "ZaphodHeads" "LVDS,VGA-0" will assign
xrandr outputs LVDS and VGA-0 to this instance of the driver.
TEXTURED VIDEO ATTRIBUTES
The driver supports the following X11 Xv attributes for Textured Video.
You can use the "xvattr" tool to query/set those attributes at runtime.
XV_VSYNC 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
XV_BICUBIC 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 'off'(0).
Xorg(1), xorg.conf(5), Xserver(1), X(7)
1. Wiki page:
2. Overview about radeon development code:
3. Mailing list:
4. IRC channel:
#radeon on irc.freenode.net
5. Query the bugtracker for radeon bugs:
6. 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 Danzer email@example.com
Alex Deucher firstname.lastname@example.org
Bogdan D. email@example.com
Eric Anholt firstname.lastname@example.org