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 mach64.ko Ta Cd mach64drm Ta Mach64 (3D Rage Pro, Rage) 52.It Pa mga.ko Ta Cd mgadrm Ta Matrox G[24]00, G[45]50 53.It Pa r128.ko Ta Cd r128drm Ta Rage 128 54.It Pa radeon.ko Ta Cd radeondrm Ta Radeon 55.It Pa savage.ko Ta Cd savagedrm Ta S3 Savage 56.It Pa sis.ko Ta Cd sisdrm Ta SiS 57.It Pa tdfx.ko Ta Cd tdfxdrm Ta 3dfx (Voodoo) 58.\".It Pa via.ko Ta Cd viadrm Ta VIA 59.El 60.Pp 61In most cases 62.Xr Xorg 1 63will take care of loading the appropriate modules and it is not necessary to 64modify 65.Xr loader.conf 5 66or the kernel configuration to enable 67.Nm 68support. 69.Pp 70Newer versions of 71.Xr Xorg 1 , 72like the one from 73.Xr dports 7 , 74do a pretty good job of figuring out the right configuration on their own, 75so having no 76.Xr xorg.conf 5 77file at all is usually the best advice. 78If for some reason an 79.Xr xorg.conf 5 80is preferred, DRI must be enabled: 81.Bd -literal 82Section "DRI" 83 Group "wheel" 84 Mode 0660 85EndSection 86.Ed 87.Pp 88With KMS, DRI is always enabled since the 89.Nm 90is always required. 91.\".Pp 92.\"In order to use two graphics cards (an on-board and another 93.\"AGP/PCI/PCIe card) with DRI, a 94.\".Pa /dev/dri/card1 95.\"link to 96.\".Pa /dev/dri/card0 97.\"has to be created using 98.\".Xr devfsctl 8 . 99.Pp 100If 101.Xr Xorg 1 102acceleration fails to initialize with a 103.Dq contigmalloc_map: failed size... 104error in dmesg, the reserve of memory for DMA ran out early and should 105be increased to a sufficiently high value by setting the 106.Va vm.dma_reserved 107loader tunable. 108A read only 109.Xr sysctl 8 110variable of the same name is provided for obtaining its current value. 111.Pp 112Debugging output can be enabled and disabled by setting the 113.Xr sysctl 8 114node 115.Ar hw.dri.0.debug . 116.Sh SEE ALSO 117.Xr Xorg 1 , 118.Xr xorg.conf 5 119.Sh HISTORY 120DRM was first available for Linux. 121Subsequently Eric Anholt ported the DRM kernel modules to 122.Fx . 123.Sh CAVEATS 124Disable AIGLX if necessary 125.Pq Pa xorg.conf : 126.Bd -literal -offset indent 127Section "ServerFlags" 128 Option "AIGLX" "off" 129EndSection 130.\" 131.\"Section "Extensions" 132.\" Option "Composite" "Disable" 133.\"EndSection 134.Ed 135.Pp 136.Cd options DRM_DEBUG 137can slow DRI down a lot, disable it once 138.Nm 139works. 140