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 ".Pa radeonkms.ko" ".Sy Kernel Option" ".Sy Chipset"
45 .It Sy Module Ta Sy "Kernel option" Ta Sy Chipset
46 .It Pa i915.ko Ta i915 Ta Intel i915, i945, i965, G3x, G4x
47 .It Pa radeonkms.ko Ta radeon Ta AMD/ATI 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
83 devices user must be a member of the
86 Users can be added to the
92 .\"In order to use two graphics cards (an on-board and another
93 .\"AGP/PCI/PCIe card) with DRI, a
97 .\"has to be created using
102 acceleration fails to initialize with a
103 .Dq contigmalloc_map: failed size...
104 error in dmesg, the reserve of memory for DMA ran out early and should
105 be increased to a sufficiently high value by setting the
110 variable of the same name is provided for obtaining its current value.
112 Tunables can be set at the
114 prompt before booting the kernel or stored in
116 .Bl -tag -width "xxxxxx"
118 Enable internal verbose debug messages, might slow down the machine.
119 Debug categories are enabled by setting their bits:
120 .Bl -tag -width "xxxxx"
122 CORE - generic drm code
124 DRIVER - vendor specific parts of the driver
126 KMS - modesetting troubleshoot
128 PRIME (no prime support)
130 ATOMIC - atomic code used by i915
132 PID - include pid number (useful in certain scenarios)
134 FIOCTL - failed ioctls
136 IOCTL - very spammy ioctl prints
138 VBLANK - very spammy vblank prints
140 .It Va drm.edid_firmware
141 Load external EDID binary monitor data from a firmware module.
142 Useful if the monitor is not sending an appropriate EDID block, if there
143 is no video on the connected monitor or if there is a need to enforce
145 Optionally, the connector name can be specified before the firmware name
149 .Dl drm.edid_firmware="DVI-D-1:edidfw_repaired"
155 use different naming conventions for connector names.
156 This tunable only applies for KMS drivers.
157 .It Va drm.video.<connector>
158 Can be used to set framebuffer parameters for drm(4) connector.
159 Mode specifier format:
161 .Dl <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
162 .Bl -tag -width "<refresh>"
164 X resolution, e.g. 1920
166 Y resolution, e.g. 1080
168 calculate timings using VESA CVT instead of table lookups
170 reduced blanking on digital monitors
176 calculate timings for interlaced mode
178 margins used in calculations
182 same as e option, but force digital output on HDMI/DVI
190 variables are available:
191 .Bl -tag -width ".Va hw.dri.vblank_offdelay"
193 If set, enables debugging output.
194 .It Va hw.dri.vblank_offdelay
195 Specifies the delay (in milliseconds) until the vblank
196 interrupt is disabled again when it's no longer needed.
197 (0 = never disable, negative value = disable immediately)
198 .It Va hw.dri.%d.busid
199 Indicates the location of the device on the PCI bus.
202 .Dl [0000-ffff]:[00-ff]:[00-1f].[0-7]
203 .It Va hw.dri.%d.modesetting
204 Indicates if kernel mode setting
206 feature) is set in the device driver.
214 DRM was first available for Linux.
215 Subsequently Eric Anholt ported the DRM kernel modules to
218 Disable AIGLX if necessary
220 .Bd -literal -offset indent
221 Section "ServerFlags"
225 .\"Section "Extensions"
226 .\" Option "Composite" "Disable"
230 .Cd options DRM_DEBUG
231 can slow DRI down a lot, disable it once