1 .\" $NetBSD: drm.4,v 1.7 2009/05/12 08:16:46 wiz Exp $
3 .\" Copyright (c) 2007 Thomas Klausner
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31 .Nd Direct Rendering Manager (DRI kernel support)
34 .Tn Direct Rendering Manager
36 .Tn Direct Rendering Infrastructure
38 .Pa http://dri.freedesktop.org/ )
39 for supporting video acceleration.
43 drivers provide support for the following chipsets:
44 .Bl -column -offset indent ".Sy ModuleXXX" ".Sy Kernel option" ".Sy Chipset"
45 .It Sy Module Ta Sy "Kernel option" Ta Sy Chipset
46 .It Pa i915.ko Ta n/a Ta Intel i915, i945, i965, G3x, G4x
47 .It Pa radeonkms.ko Ta n/a Ta AMD Radeon
52 will take care of loading the appropriate modules and it is not necessary to
55 or the kernel configuration to enable
63 do a pretty good job of figuring out the right configuration on their own,
66 file at all is usually the best advice.
69 is preferred, DRI must be enabled:
77 With KMS, DRI is always enabled since the
81 .\"In order to use two graphics cards (an on-board and another
82 .\"AGP/PCI/PCIe card) with DRI, a
86 .\"has to be created using
91 acceleration fails to initialize with a
92 .Dq contigmalloc_map: failed size...
93 error in dmesg, the reserve of memory for DMA ran out early and should
94 be increased to a sufficiently high value by setting the
99 variable of the same name is provided for obtaining its current value.
101 Tunables can be set at the
103 prompt before booting the kernel or stored in
105 .Bl -tag -width "xxxxxx"
106 .It Va drm.edid_firmware
107 Load external EDID binary monitor data from firmware module.
108 Useful if monitor is not sending appropiate EDID block, no video on
109 connected monitor or there is a need to enforce custom video modes.
110 Optionally, connector name can be specified before firmware name
111 followed by colon, for example:
113 .Dl drm.edid_firmware="DVI-D-1:edidfw_repaired"
119 use different naming conventions for connector names.
120 This tunable only applies for KMS drivers.
121 .It Va drm.video.<connector>
122 Can be used to set framebuffer parameters for drm(4) connector
123 in lower case form and without dashes.
124 Mode specifier format:
126 .Dl <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
127 .Bl -tag -width "<refresh>"
129 X resolution, e.g. 1920
131 Y resolution, e.g. 1080
133 calculate timings using VESA CVT instead of table lookups
135 reduced blanking on digital monitors
141 calculate timings for interlaced mode
143 margins used in calculations
147 same as e option, but force digital output on HDMI/DVI
155 variables are available:
156 .Bl -tag -width ".Va hw.dri.vblank_offdelay"
158 If set, enables debugging output.
159 .It Va hw.dri.vblank_offdelay
160 Specifies the delay (in milliseconds) until the vblank
161 interrupt is disabled again when it's no longer needed.
162 (0 = never disable, negative value = disable immediately)
163 .It Va hw.dri.%d.busid
164 Indicates the location of the device on the PCI bus.
167 .Dl [0000-ffff]:[00-ff]:[00-1f].[0-7]
168 .It Va hw.dri.%d.modesetting
169 Indicates if kernel mode setting
171 feature) is set in the device driver.
179 DRM was first available for Linux.
180 Subsequently Eric Anholt ported the DRM kernel modules to
183 Disable AIGLX if necessary
185 .Bd -literal -offset indent
186 Section "ServerFlags"
190 .\"Section "Extensions"
191 .\" Option "Composite" "Disable"
195 .Cd options DRM_DEBUG
196 can slow DRI down a lot, disable it once