DragonFly On-Line Manual Pages

DRM(4)		      DragonFly Kernel Interfaces Manual		DRM(4)

NAME
     drm -- Direct Rendering Manager (DRI kernel support)

SYNOPSIS
     device drm
     device i915drm
     device mach64drm
     device mgadrm
     device r128drm
     device radeondrm
     device savagedrm
     device sisdrm
     device tdfxdrm

     options DRM_DEBUG

DESCRIPTION
     The Direct Rendering Manager is part of the Direct Rendering
     Infrastructure (see http://dri.freedesktop.org/) for supporting video
     acceleration.  For older chipsets it's used for 3d acceleration only, but
     newer chipsets may require drm for 2d acceleration (XVideo, EXA) as well.

     The drm drivers provide support for the following chipsets:

	   i915drm	  Intel i915, i945, i965, G3x, G4x
	   mach64drm	  Mach64 (3D Rage Pro, Rage)
	   mgadrm	  Matrox G[24]00, G[45]50
	   r128drm	  ATI Rage 128
	   radeondrm	  ATI Radeon
	   savagedrm	  S3 Savage
	   sisdrm	  SiS
	   tdfxdrm	  3dfx (Voodoo)

     To make use of the driver:

     *	 The kernel must include agp(4)
     *	 Xorg(1), MesaLib and the video driver to be used must be compiled
	 with DRI support
     *	 DRI must be enabled in the xorg.conf(5) configuration file:

	 Section "DRI"
		 Group "wheel"
		 Mode 0660
	 EndSection

     In order to use two graphics cards (an on-board and another AGP/PCI/PCIe
     card) with DRI, a /dev/dri/card1 link to /dev/dri/card0 has to be created
     using devfsctl(8).

     If Xorg(1) acceleration fails to initialize with a ``contigmalloc_map:
     failed size...'' error in dmesg, the reserve of memory for DMA ran out
     early and should be increased to a sufficiently high value by setting the
     vm.dma_reserved loader tunable.  A read only sysctl(8) variable of the
     same name is provided for obtaining its current value.

     Debugging output can be enabled and disabled by setting the sysctl(8)
     node hw.dri.0.debug.

SEE ALSO
     Xorg(1), agp(4), xorg.conf(5)

HISTORY
     DRM was first available for Linux.  Subsequently Eric Anholt ported the
     DRM kernel modules to FreeBSD.

CAVEATS
     Disable AIGLX if necessary (xorg.conf):

	   Section "ServerFlags"
		   Option  "AIGLX" "off"
	   EndSection

	   Section "Extensions"
		   Option "Composite" "Disable"
	   EndSection

     options DRM_DEBUG can slow DRI down a lot, disable it once drm works.

DragonFly 3.5		       January 11, 2012 		 DragonFly 3.5