132 lines
5.3 KiB
Groff
132 lines
5.3 KiB
Groff
.\" shorthand for double quote that works everywhere.
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.ds q \N'34'
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.TH MODESETTING @drivermansuffix@ @vendorversion@
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.SH NAME
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modesetting \- video driver for framebuffer device
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.SH SYNOPSIS
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.nf
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.B "Section \*qDevice\*q"
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.BI " Identifier \*q" devname \*q
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.B " Driver \*qmodesetting\*q"
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.BI " BusID \*qpci:" bus : dev : func \*q
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\ \ ...
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.B EndSection
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.fi
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.SH DESCRIPTION
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.B modesetting
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is an @xservername@ driver for KMS devices. This driver supports
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TrueColor visuals at framebuffer depths of 15, 16, 24, and 30. RandR
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1.2 is supported for multi-head configurations. Acceleration is available
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through glamor for devices supporting at least OpenGL ES 2.0 or OpenGL 2.1.
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If glamor is not enabled, a shadow framebuffer is configured based on the
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KMS drivers' preference (unless the framebuffer is 24 bits per pixel, in
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which case the shadow framebuffer is always used).
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.SH SUPPORTED HARDWARE
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The
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.B modesetting
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driver supports all hardware where a KMS driver is available.
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modesetting uses the Linux DRM KMS ioctls and dumb object create/map.
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.SH CONFIGURATION DETAILS
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Please refer to @xconfigfile@(@filemansuffix@) for general configuration
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details. This section only covers configuration details specific to
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this driver.
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.PP
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For this driver it is not required to specify modes in the screen
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section of the config file. The
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.B modesetting
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driver can pick up the currently used video mode from the kernel
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driver and will use it if there are no video modes configured.
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.PP
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For PCI boards you might have to add a BusID line to the Device
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section. See above for a sample line.
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.PP
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The following driver
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.B Options
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are supported:
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.TP
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.BI "Option \*qSWcursor\*q \*q" boolean \*q
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Selects software cursor. The default is
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.B off.
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.TP
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.BI "Option \*qkmsdev\*q \*q" string \*q
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The framebuffer device to use. Default: /dev/dri/card0.
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.TP
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.BI "Option \*qShadowFB\*q \*q" boolean \*q
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Enable or disable use of the shadow framebuffer layer. Default: on.
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.TP
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.BI "Option \*qDoubleShadow\*q \*q" boolean \*q
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Double-buffer shadow updates. When enabled, the driver will keep two copies of
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the shadow framebuffer. When the shadow framebuffer is flushed, the old and new
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versions of the shadow are compared, and only tiles that have actually changed
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are uploaded to the device. This is an optimization for server-class GPUs with
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a remote display function (typically VNC), where remote updates are triggered
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by any framebuffer write, so minimizing the amount of data uploaded is crucial.
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This defaults to enabled for ASPEED and Matrox G200 devices, and disabled
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otherwise.
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.TP
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.BI "Option \*qAccelMethod\*q \*q" string \*q
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One of \*qglamor\*q or \*qnone\*q. Default: glamor.
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.TP
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.BI "Option \*qPageFlip\*q \*q" boolean \*q
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Enable DRI3 page flipping. The default is
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.B on.
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.TP
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.BI "Option \*qVariableRefresh\*q \*q" boolean \*q
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Enables support for enabling variable refresh on the Screen's CRTCs
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when an suitable application is flipping via the Present extension.
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.br
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The default is
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.B off.
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.TP
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.BI "Option \*qAsyncFlipSecondaries\*q \*q" boolean \*q
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Use async flips for secondary video outputs on multi-display setups. If a screen
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has multiple displays attached and DRI3 page flipping is used, then only one of
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the displays will have its page flip synchronized to vblank for tear-free
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presentation. This is the display that is used for presentation timing and
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timestamping, usually the one covering the biggest pixel area of the screen.
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All other displays ("Secondaries") will not synchronize their flips. This may
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cause some tearing on these displays, but it prevents a permanent or periodic
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slowdown or irritating judder of animations if not all video outputs are running
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synchronized with each other and with the same refresh rate. There is no perfect
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solution apart from perfectly synchronized outputs, but this option may give
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preferrable results if the displays in a multi-display setup mirror or clone
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each other. The default is
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.B off.
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.TP
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.BI "Option \*qZaphodHeads\*q \*q" string \*q
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Specify the RandR output(s) to use with zaphod mode for a particular driver
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instance. If you use this option you must use this option for all instances
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of the driver.
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.br
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For example:
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.B
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Option \*qZaphodHeads\*q \*qLVDS,VGA-0\*q
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will assign xrandr outputs LVDS and VGA-0 to this instance of the driver.
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.TP
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.BI "Option \*qUseGammaLUT\*q \*q" boolean \*q
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Enable or disable use of the GAMMA_LUT property, when available.
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When enabled, this option allows the driver to use gamma ramps with more
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entries, if supported by the kernel. By default, GAMMA_LUT will be used for
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kms drivers which are known to be safe for use of GAMMA_LUT.
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.TP
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.BI "Option \*qTearFree\*q \*q" boolean \*q
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Enable tearing prevention using the hardware page flipping mechanism.
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It allocates two extra scanout buffers for each CRTC and utilizes damage
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tracking to minimize buffer copying and skip unnecessary flips when the
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screen's contents have not changed. It works on transformed screens too, such
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as rotated and scaled CRTCs. When PageFlip is enabled, fullscreen DRI
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applications will still have the discretion to not use tearing prevention.
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.br
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The default is
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.B on.
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.TP
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.BI "Option \*qAtomic\*q \*q" boolean \*q
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Enable atomic modesetting when supported. The default is
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.B off.
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.TP
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.SH "SEE ALSO"
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@xservername@(@appmansuffix@), @xconfigfile@(@filemansuffix@), Xserver(@appmansuffix@),
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X(@miscmansuffix@)
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.SH AUTHORS
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Authors include: Dave Airlie
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