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https://github.com/X11Libre/xf86-video-amdgpu.git
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b11ee02c45
This patch adds support for setting the CRTC variable refresh property for suitable windows flipping via the Present extension. The "VariableRefresh" Option is added to AMDGPU in this patch. This option defaults to false, and must be set to "true" in an X conf file for variable refresh support in the driver. In order for a window to be suitable for variable refresh it must have the _VARIABLE_REFRESH property with a 32-bit CARDINAL value of 1. Then the window must pass the checks required to be suitable for Present extension flips - it must cover the entire X screen and no other window may already be flipping. With these conditions met every CRTC for the X screen will have their variable refresh property set to true. Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
156 lines
4.2 KiB
Groff
156 lines
4.2 KiB
Groff
.ds q \N'34'
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.TH AMDGPU __drivermansuffix__ __vendorversion__
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.SH NAME
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amdgpu \- AMD RADEON GPU video driver
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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 \*qamdgpu\*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 amdgpu
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is an __xservername__ driver for AMD RADEON-based video cards with the
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following features:
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.PP
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.PD 0
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.TP 2
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\(bu
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Support for 8-, 15-, 16-, 24- and 30-bit pixel depths;
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.TP
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\(bu
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RandR support up to version 1.4;
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.TP
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\(bu
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3D acceleration;
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.PD
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.SH SUPPORTED HARDWARE
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The
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.B amdgpu
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driver supports SI and newer families' video cards.
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.PD
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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 this
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driver.
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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 \*qAccel\*q \*q" boolean \*q
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Enables or disables all hardware acceleration.
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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 \*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 \*qDRI\*q \*q" integer \*q
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Define the maximum level of DRI to enable. Valid values are 2 for DRI2 or 3 for DRI3.
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The default is
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.B 3 for DRI3
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if the Xorg version is >= 1.18.3, otherwise
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.B 2 for DRI2.
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.TP
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.BI "Option \*qEnablePageFlip\*q \*q" boolean \*q
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Enable DRI2 page flipping. The default is
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.B on.
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.TP
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.BI "Option \*qTearFree\*q \*q" boolean \*q
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Set the default value of the per-output 'TearFree' property, which controls
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tearing prevention using the hardware page flipping mechanism. TearFree is
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on for any CRTC associated with one or more outputs with TearFree on. Two
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separate scanout buffers need to be allocated for each CRTC with TearFree
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on. If this option is set, the default value of the property is 'on' or 'off'
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accordingly. If this option isn't set, the default value of the property is
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.B auto,
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which means that TearFree is on for rotated outputs, outputs with RandR
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transforms applied and for RandR 1.4 slave outputs, otherwise off.
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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 \*qAccelMethod\*q \*q" string \*q
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Setting this option to
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.B none
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disables use of the glamor acceleration architecture. In that case, all 2D
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rendering is done by the CPU, but 3D and video hardware acceleration can still
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work. This is mainly useful for OpenGL driver bring-up.
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.br
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The default is to use glamor.
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.PP
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The following driver
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.B Option
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is supported for
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.B glamor
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:
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.TP
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.BI "Option \*qShadowPrimary\*q \*q" boolean \*q
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This option enables a so-called "shadow primary" buffer for fast CPU access to
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pixel data, and separate scanout buffers for each display controller (CRTC).
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This may improve performance for some 2D workloads, potentially at the expense
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of other (e.g. 3D, video) workloads.
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Note in particular that enabling this option currently disables page flipping.
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The default is
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.B off.
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.SH SEE ALSO
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__xservername__(__appmansuffix__), __xconfigfile__(__filemansuffix__), Xserver(__appmansuffix__), X(__miscmansuffix__)
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.IP " 1." 4
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Wiki page:
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.RS 4
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https://www.x.org/wiki/radeon
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.RE
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.IP " 2." 4
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Overview about amdgpu development code:
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.RS 4
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https://cgit.freedesktop.org/xorg/driver/xf86-video-amdgpu/
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.RE
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.IP " 3." 4
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Mailing list:
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.RS 4
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https://lists.freedesktop.org/mailman/listinfo/amd-gfx
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.RE
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.IP " 4." 4
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IRC channel:
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.RS 4
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#radeon on irc.freenode.net
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.RE
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.IP " 5." 4
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Query the bugtracker for amdgpu bugs:
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.RS 4
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https://bugs.freedesktop.org/query.cgi?product=xorg&component=Driver/AMDgpu
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.RE
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.IP " 6." 4
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Submit bugs & patches:
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.RS 4
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https://bugs.freedesktop.org/enter_bug.cgi?product=xorg&component=Driver/AMDgpu
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.RE
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.SH AUTHORS
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.nf
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Authors include:
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Michel D\(:anzer \fImichel@daenzer.net\fP
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Alex Deucher \fIalexdeucher@gmail.com\fP
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