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

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

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:

            Module       Kernel       Chipset
            i915kms.ko   n/a          Intel i915, i945, i965, G3x, G4x
            mach64.ko    mach64drm    Mach64 (3D Rage Pro, Rage)
            mga.ko       mgadrm       Matrox G[24]00, G[45]50
            r128.ko      r128drm      Rage 128
            radeon.ko    radeondrm    Radeon
            savage.ko    savagedrm    S3 Savage
            sis.ko       sisdrm       SiS
            tdfx.ko      tdfxdrm      3dfx (Voodoo)

     In most cases Xorg(1) will take care of loading the appropriate modules
     and it is not necessary to modify loader.conf(5) or the kernel
     configuration to enable drm support.

     Newer versions of Xorg(1), like the one from dports(7), do a pretty good
     job of figuring out the right configuration on their own, so having no
     xorg.conf(5) file at all is usually the best advice.  If for some reason
     an xorg.conf(5) is preferred, DRI must be enabled:

     Section "DRI"
             Group "wheel"
             Mode 0660
     EndSection

     With KMS, DRI is always enabled since the drm is always required.

     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), 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

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

DragonFly 3.5                 September 13, 2013                 DragonFly 3.5