oracular (4) amdgpu.4.gz

NAME

       amdgpu - AMD RADEON GPU video driver

SYNOPSIS

       Section "Device"
         Identifier "devname"
         Driver "amdgpu"
         ...
       EndSection

DESCRIPTION

       amdgpu is an Xorg driver for AMD RADEON-based video cards with the following features:

       • Support for 8-, 15-, 16-, 24- and 30-bit pixel depths;
       • RandR support up to version 1.4;
       • 3D acceleration;

SUPPORTED HARDWARE

       The amdgpu driver supports SI and newer families' video cards.

CONFIGURATION DETAILS

       Please  refer  to xorg.conf(5) for general configuration details.  This section only covers configuration
       details specific to this driver.

       The following driver Options are supported:

       Option "SWcursor" "boolean"
              Selects software cursor.  The default is off.

       Option "Accel" "boolean"
              Enables or disables all hardware acceleration.
              The default is on.

       Option "ZaphodHeads" "string"
              Specify the RandR output(s) to use with zaphod mode for a particular driver instance.  If you  use
              this option you must 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.

       Option "DRI" "integer"
              Define the maximum level of DRI to enable. Valid values are 2 for DRI2 or 3 for DRI3.  The default
              is 3 for DRI3 if the Xorg version is >= 1.18.3, otherwise 2 for DRI2.

       Option "EnablePageFlip" "boolean"
              Enable DRI2 page flipping.  The default is on.

       Option "TearFree" "boolean"
              Set  the  default  value  of the per-output 'TearFree' property, which controls tearing prevention
              using the hardware page flipping mechanism. TearFree is on for any CRTC  associated  with  one  or
              more  outputs  with  TearFree  on. Two separate scanout buffers need to be allocated for each CRTC
              with TearFree on. If this option is set, the default value  of  the  property  is  'on'  or  'off'
              accordingly. If this option isn't set, the default value of the property is auto, which means that
              TearFree is on for rotated outputs, outputs with  RandR  transforms  applied  and  for  RandR  1.4
              secondary outputs, otherwise off.

       Option "VariableRefresh" "boolean"
              Enables  support  for enabling variable refresh on the Screen's CRTCs when an suitable application
              is flipping via the Present extension.
              The default is off.

       Option "AsyncFlipSecondaries" "boolean"
              Use async flips for secondary video outputs on multi-display setups.  If  a  screen  has  multiple
              displays attached and DRI3 page flipping is used, then only one of the displays will have its page
              flip synchronized to vblank for tear-free presentation. This is  the  display  that  is  used  for
              presentation  timing  and  timestamping,  usually  the  one covering the biggest pixel area of the
              screen.  All other displays ("Secondaries") will not synchronize their flips. This may cause  some
              tearing  on  these displays, but it prevents a permanent or periodic slowdown or irritating judder
              of animations if not all video outputs are running synchronized with each other and with the  same
              refresh  rate.  There  is  no perfect solution apart from perfectly synchronized outputs, but this
              option may give preferrable results if the displays in a multi-display setup mirror or clone  each
              other.  The default is off.

       Option "AccelMethod" "string"
              Setting  this  option  to none disables use of the glamor acceleration architecture. In that case,
              all 2D rendering is done by the CPU, but 3D and video hardware acceleration can still  work.  This
              is mainly useful for OpenGL driver bring-up.
              The default is to use glamor.

       The following driver Option is supported for glamor :

       Option "ShadowPrimary" "boolean"
              This  option  enables  a  so-called "shadow primary" buffer for fast CPU access to pixel data, and
              separate scanout buffers for each display controller (CRTC).  This  may  improve  performance  for
              some  2D  workloads,  potentially  at  the  expense  of other (e.g. 3D, video) workloads.  Note in
              particular that enabling this option currently disables page flipping.  The default is off.

SEE ALSO

       Xorg(1), xorg.conf(5), Xserver(1), X(7)

        1. Wiki page:
           https://www.x.org/wiki/radeon

        2. Overview about amdgpu development code:
           https://gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu

        3. Mailing list:
           https://lists.freedesktop.org/mailman/listinfo/amd-gfx

        4. IRC channel:
           #radeon on irc.freenode.net

        5. The bugtracker for amdgpu bugs:
           https://gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu/-/issues

        6. Submit merge requests:
           https://gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu/-/merge_requests

AUTHORS

       Authors include:
       Michel Dänzer            michel@daenzer.net
       Alex Deucher             alexdeucher@gmail.com