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MODESETTING(4)                        Kernel Interfaces Manual                        MODESETTING(4)



NAME
       modesetting - video driver for framebuffer device

SYNOPSIS
       Section "Device"
         Identifier "devname"
         Driver "modesetting"
         BusID  "pci:bus:dev:func"
         ...
       EndSection

DESCRIPTION
       modesetting  is  an  Xorg  driver for KMS devices.  This driver supports TrueColor visuals at
       framebuffer depths of 15, 16, 24, and 30. RandR 1.2 is supported  for  multi-head  configura‐
       tions. Acceleration is available through glamor for devices supporting at least OpenGL ES 2.0
       or OpenGL 2.1.  If glamor is not enabled, a shadow framebuffer is configured based on the KMS
       drivers'  preference  (unless  the framebuffer is 24 bits per pixel, in which case the shadow
       framebuffer is always used).

SUPPORTED HARDWARE
       The modesetting driver supports all hardware where a KMS driver  is  available.   modesetting
       uses the Linux DRM KMS ioctls and dumb object create/map.

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

       For this driver it is not required to specify modes in the screen section of the config file.
       The  modesetting  driver can pick up the currently used video mode from the kernel driver and
       will use it if there are no video modes configured.

       For PCI boards you might have to add a BusID line to the Device section.   See  above  for  a
       sample line.

       The following driver Options are supported:

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

       Option "kmsdev" "string"
              The framebuffer device to use. Default: /dev/dri/card0.

       Option "ShadowFB" "boolean"
              Enable or disable use of the shadow framebuffer layer.  Default: on.

       Option "DoubleShadow" "boolean"
              Double-buffer  shadow  updates.  When  enabled, the driver will keep two copies of the
              shadow framebuffer. When the shadow framebuffer is flushed, the old and  new  versions
              of  the shadow are compared, and only tiles that have actually changed are uploaded to
              the device. This is an optimization for server-class GPUs with a remote display  func‐
              tion  (typically VNC), where remote updates are triggered by any framebuffer write, so
              minimizing the amount of data uploaded is crucial.  This defaults to enabled  for  AS‐
              PEED and Matrox G200 devices, and disabled otherwise.

       Option "AccelMethod" "string"
              One of "glamor" or "none".  Default: glamor.

       Option "PageFlip" "boolean"
              Enable DRI3 page flipping.  The default is on.

       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 dis‐
              plays 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 "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 "UseGammaLUT" "boolean"
              Enable or disable use of the GAMMA_LUT property, when available.  When  enabled,  this
              option  allows  the  driver  to use gamma ramps with more entries, if supported by the
              kernel. By default, GAMMA_LUT will be used for kms drivers which are known to be  safe
              for use of GAMMA_LUT.


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

AUTHORS
       Authors include: Dave Airlie



X Version 11                             xorg-server 21.1.4                           MODESETTING(4)