1.\" $NetBSD: drm.4,v 1.7 2009/05/12 08:16:46 wiz Exp $ 2.\" 3.\" Copyright (c) 2007 Thomas Klausner 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25.\" 26.Dd September 13, 2013 27.Dt DRM 4 28.Os 29.Sh NAME 30.Nm drm 31.Nd Direct Rendering Manager (DRI kernel support) 32.Sh DESCRIPTION 33The 34.Tn Direct Rendering Manager 35is part of the 36.Tn Direct Rendering Infrastructure 37(see 38.Pa http://dri.freedesktop.org/ ) 39for supporting video acceleration. 40For older chipsets it's used for 3d acceleration only, but newer chipsets 41may require 42.Nm 43for 2d acceleration (XVideo, EXA) as well. 44.Pp 45The 46.Nm 47drivers provide support for the following chipsets: 48.Bl -column -offset indent ".Sy ModuleXXX" ".Sy Kernel option" ".Sy Chipset" 49.It Sy Module Ta Sy "Kernel option" Ta Sy Chipset 50.It Pa i915kms.ko Ta n/a Ta Intel i915, i945, i965, G3x, G4x 51.It Pa radeon.ko Ta Cd radeondrm Ta Radeon 52.El 53.Pp 54In most cases 55.Xr Xorg 1 56will take care of loading the appropriate modules and it is not necessary to 57modify 58.Xr loader.conf 5 59or the kernel configuration to enable 60.Nm 61support. 62.Pp 63Newer versions of 64.Xr Xorg 1 , 65like the one from 66.Xr dports 7 , 67do a pretty good job of figuring out the right configuration on their own, 68so having no 69.Xr xorg.conf 5 70file at all is usually the best advice. 71If for some reason an 72.Xr xorg.conf 5 73is preferred, DRI must be enabled: 74.Bd -literal 75Section "DRI" 76 Group "wheel" 77 Mode 0660 78EndSection 79.Ed 80.Pp 81With KMS, DRI is always enabled since the 82.Nm 83is always required. 84.\".Pp 85.\"In order to use two graphics cards (an on-board and another 86.\"AGP/PCI/PCIe card) with DRI, a 87.\".Pa /dev/dri/card1 88.\"link to 89.\".Pa /dev/dri/card0 90.\"has to be created using 91.\".Xr devfsctl 8 . 92.Pp 93If 94.Xr Xorg 1 95acceleration fails to initialize with a 96.Dq contigmalloc_map: failed size... 97error in dmesg, the reserve of memory for DMA ran out early and should 98be increased to a sufficiently high value by setting the 99.Va vm.dma_reserved 100loader tunable. 101A read only 102.Xr sysctl 8 103variable of the same name is provided for obtaining its current value. 104.Pp 105Debugging output can be enabled and disabled by setting the 106.Xr sysctl 8 107node 108.Ar hw.dri.0.debug . 109.Sh SEE ALSO 110.Xr Xorg 1 , 111.Xr xorg.conf 5 112.Sh HISTORY 113DRM was first available for Linux. 114Subsequently Eric Anholt ported the DRM kernel modules to 115.Fx . 116.Sh CAVEATS 117Disable AIGLX if necessary 118.Pq Pa xorg.conf : 119.Bd -literal -offset indent 120Section "ServerFlags" 121 Option "AIGLX" "off" 122EndSection 123.\" 124.\"Section "Extensions" 125.\" Option "Composite" "Disable" 126.\"EndSection 127.Ed 128.Pp 129.Cd options DRM_DEBUG 130can slow DRI down a lot, disable it once 131.Nm 132works. 133