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31a092ae71
As of kernel commit 1ca67aba8d11 ("drm/amd/display: only accept async
flips for fast updates"), we reject async flips that used to be silently
degraded to vsync. However, this causes issues for VRR if TearFree isn't
enabled, in particular we have seen that VRR fails to engage on a
handful of tested applications and in one case we even observed an
application soft hang. So, if TearFree is set to auto we should enable
it if VariableRefresh is enabled and we should warn users if they try to
enable VariableRefresh while TearFree is disabled.
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
172 lines
5.1 KiB
Groff
172 lines
5.1 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, for RandR 1.4 secondary outputs and if 'VariableRefresh'
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is enabled, otherwise it's 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 \*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 \*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://gitlab.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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The bugtracker for amdgpu bugs:
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.RS 4
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https://gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu/-/issues
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.RE
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.IP " 6." 4
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Submit merge requests:
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.RS 4
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https://gitlab.freedesktop.org/xorg/driver/xf86-video-amdgpu/-/merge_requests
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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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