135 lines
5.3 KiB
Groff
135 lines
5.3 KiB
Groff
.\" shorthand for double quote that works everywhere.
|
|
.ds q \N'34'
|
|
.TH MODESETTING @drivermansuffix@ @vendorversion@
|
|
.SH NAME
|
|
modesetting \- video driver for framebuffer device
|
|
.SH SYNOPSIS
|
|
.nf
|
|
.B "Section \*qDevice\*q"
|
|
.BI " Identifier \*q" devname \*q
|
|
.B " Driver \*qmodesetting\*q"
|
|
.BI " BusID \*qpci:" bus : dev : func \*q
|
|
\ \ ...
|
|
.B EndSection
|
|
.fi
|
|
.SH DESCRIPTION
|
|
.B modesetting
|
|
is an @xservername@ 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 configurations. 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).
|
|
.SH SUPPORTED HARDWARE
|
|
The
|
|
.B modesetting
|
|
driver supports all hardware where a KMS driver is available.
|
|
modesetting uses the Linux DRM KMS ioctls and dumb object create/map.
|
|
.SH CONFIGURATION DETAILS
|
|
Please refer to
|
|
.BR @xconfigfile@ (@filemansuffix@)
|
|
for general configuration details.
|
|
This section only covers configuration details specific to this driver.
|
|
.PP
|
|
For this driver it is not required to specify modes in the screen
|
|
section of the config file. The
|
|
.B 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.
|
|
.PP
|
|
For PCI boards you might have to add a BusID line to the Device
|
|
section. See above for a sample line.
|
|
.PP
|
|
The following driver
|
|
.B Options
|
|
are supported:
|
|
.TP
|
|
.BI "Option \*qSWcursor\*q \*q" boolean \*q
|
|
Selects software cursor. The default is
|
|
.B off.
|
|
.TP
|
|
.BI "Option \*qkmsdev\*q \*q" string \*q
|
|
The framebuffer device to use. Default: /dev/dri/card0.
|
|
.TP
|
|
.BI "Option \*qShadowFB\*q \*q" boolean \*q
|
|
Enable or disable use of the shadow framebuffer layer. Default: on.
|
|
.TP
|
|
.BI "Option \*qDoubleShadow\*q \*q" boolean \*q
|
|
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 function (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 ASPEED and Matrox G200 devices, and disabled
|
|
otherwise.
|
|
.TP
|
|
.BI "Option \*qAccelMethod\*q \*q" string \*q
|
|
One of \*qglamor\*q or \*qnone\*q. Default: glamor.
|
|
.TP
|
|
.BI "Option \*qPageFlip\*q \*q" boolean \*q
|
|
Enable DRI3 page flipping. The default is
|
|
.B on.
|
|
.TP
|
|
.BI "Option \*qVariableRefresh\*q \*q" boolean \*q
|
|
Enables support for enabling variable refresh on the Screen's CRTCs
|
|
when an suitable application is flipping via the Present extension.
|
|
.br
|
|
The default is
|
|
.B off.
|
|
.TP
|
|
.BI "Option \*qAsyncFlipSecondaries\*q \*q" boolean \*q
|
|
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
|
|
.B off.
|
|
.TP
|
|
.BI "Option \*qZaphodHeads\*q \*q" string \*q
|
|
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.
|
|
.br
|
|
For example:
|
|
.B
|
|
Option \*qZaphodHeads\*q \*qLVDS,VGA-0\*q
|
|
will assign xrandr outputs LVDS and VGA-0 to this instance of the driver.
|
|
.TP
|
|
.BI "Option \*qUseGammaLUT\*q \*q" boolean \*q
|
|
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.
|
|
.TP
|
|
.BI "Option \*qTearFree\*q \*q" boolean \*q
|
|
Enable tearing prevention using the hardware page flipping mechanism.
|
|
It allocates two extra scanout buffers for each CRTC and utilizes damage
|
|
tracking to minimize buffer copying and skip unnecessary flips when the
|
|
screen's contents have not changed. It works on transformed screens too, such
|
|
as rotated and scaled CRTCs. When PageFlip is enabled, fullscreen DRI
|
|
applications will still have the discretion to not use tearing prevention.
|
|
.br
|
|
The default is
|
|
.B on.
|
|
.TP
|
|
.BI "Option \*qAtomic\*q \*q" boolean \*q
|
|
Enable atomic modesetting when supported. The default is
|
|
.B off.
|
|
.TP
|
|
.SH "SEE ALSO"
|
|
.BR @xservername@ (@appmansuffix@),
|
|
.BR @xconfigfile@ (@filemansuffix@),
|
|
.BR Xserver (@appmansuffix@),
|
|
.BR X (@miscmansuffix@)
|
|
.SH AUTHORS
|
|
Authors include: Dave Airlie
|