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       radeon - ATI RADEON video driver


       Section "Device"
         Identifier "devname"
         Driver "radeon"


       radeon  is  an  Xorg  driver  for ATI RADEON based video cards with the
       following features:

       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
         ATOMTvOut option);
       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,
         R/RV/RS3xx, R/RV/RS4xx);
       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
                   Radeon X1300/X1400/X1500/X2300
       R520        Radeon X1800
       RV530/RV560 Radeon X1600/X1650/X1700
       RV570/R580  Radeon X1900/X1950
                   Radeon X1200/X1250/X2100
       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
              AGP bus.
              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 underflow.
              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
              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" "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.


       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

        5. Query the bugtracker for radeon bugs:

        6. Submit bugs & patches:


       Authors include:
       Rickard E. (Rik) Faith
       Kevin E. Martin
       Alan Hourihane 
       Marc Aurele La France
       Benjamin Herrenschmidt
       Michel Danzer  
       Alex Deucher   
       Bogdan D.      
       Eric Anholt