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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 ver-
sions of the shadow are compared, and only tiles that have actually changed are up-
loaded to the device. This is an optimization for server-class GPUs with a remote
display function (typically VNC), where remote updates are triggered by any frame-
buffer write, so minimizing the amount of data uploaded is crucial. This defaults
to enabled for ASPEED 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 suit-
able 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 ("Secon-
daries") 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 syn-
chronized 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 in-
stance. 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)
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