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+Direct Rendering Infrastructure (DRI) Direct Rendering Manager (drm) module
+and Translation Table Manager (ttm) module sysfs entries
+
+Example class view showing a single graphics adapter with three output
+connectors, a special control device node for the graphics adapter, and the
+Translation Table Manager (ttm) graphics memory manager virtual device:
+
+    /sys/class/drm/
+    ??? card0               -> ../../devices/<...>/drm/card0
+    ??? card0-DVI-D-1       -> ../../devices/<...>/drm/card0/card0-DVI-D-1
+    ??? card0-HDMI Type A-1 -> ../../devices/<...>/drm/card0/card0-HDMI Type A-1
+    ??? card0-VGA-1         -> ../../devices/<...>/drm/card0/card0-VGA-1
+    ??? controlD64          -> ../../devices/<...>/drm/controlD64
+    ??? ttm                 -> ../../devices/virtual/drm/ttm
+    ??? version
+
+    6 directories, 1 file
+
+
+Corresponding DRI device nodes for the example graphics adapter, with
+additional ACL properties on card0 granting rw perms to the X/console user:
+
+    crw-rw----+ 1 root video 226,  0 2010-09-21 20:52 /dev/dri/card0
+    crw-rw-rw-. 1 root video 226, 64 2010-09-21 20:51 /dev/dri/controlD64
+
+
+Example physical device view for a single graphics adapter with three output
+connectors and a special control device node for the graphics adapter:
+
+    /sys/devices/<...>/drm
+    ??? card0
+    ?   ??? card0-DVI-D-1
+    ?   ?   ??? device -> ../../card0
+    ?   ?   ??? dpms
+    ?   ?   ??? edid
+    ?   ?   ??? enabled
+    ?   ?   ??? modes
+    ?   ?   ??? polled
+    ?   ?   ??? power
+    ?   ?   ?   ??? control
+    ?   ?   ?   ??? runtime_active_time
+    ?   ?   ?   ??? runtime_status
+    ?   ?   ?   ??? runtime_suspended_time
+    ?   ?   ?   ??? wakeup
+    ?   ?   ?   ??? wakeup_count
+    ?   ?   ??? status
+    ?   ?   ??? subsystem -> ../../../../../../../class/drm
+    ?   ?   ??? uevent
+    ?   ??? card0-HDMI Type A-1
+    ?   ?   ??? device -> ../../card0
+    ?   ?   ??? dpms
+    ?   ?   ??? edid
+    ?   ?   ??? enabled
+    ?   ?   ??? modes
+    ?   ?   ??? polled
+    ?   ?   ??? power
+    ?   ?   ?   ??? control
+    ?   ?   ?   ??? runtime_active_time
+    ?   ?   ?   ??? runtime_status
+    ?   ?   ?   ??? runtime_suspended_time
+    ?   ?   ?   ??? wakeup
+    ?   ?   ?   ??? wakeup_count
+    ?   ?   ??? status
+    ?   ?   ??? subsystem -> ../../../../../../../class/drm
+    ?   ?   ??? uevent
+    ?   ??? card0-VGA-1
+    ?   ?   ??? device -> ../../card0
+    ?   ?   ??? dpms
+    ?   ?   ??? edid
+    ?   ?   ??? enabled
+    ?   ?   ??? modes
+    ?   ?   ??? polled
+    ?   ?   ??? power
+    ?   ?   ?   ??? control
+    ?   ?   ?   ??? runtime_active_time
+    ?   ?   ?   ??? runtime_status
+    ?   ?   ?   ??? runtime_suspended_time
+    ?   ?   ?   ??? wakeup
+    ?   ?   ?   ??? wakeup_count
+    ?   ?   ??? status
+    ?   ?   ??? subsystem -> ../../../../../../../class/drm
+    ?   ?   ??? uevent
+    ?   ??? dev
+    ?   ??? device -> ../../../0000:01:05.0
+    ?   ??? power
+    ?   ?   ??? control
+    ?   ?   ??? runtime_active_time
+    ?   ?   ??? runtime_status
+    ?   ?   ??? runtime_suspended_time
+    ?   ?   ??? wakeup
+    ?   ?   ??? wakeup_count
+    ?   ??? subsystem -> ../../../../../../class/drm
+    ?   ??? uevent
+    ??? controlD64
+        ??? dev
+        ??? device -> ../../../0000:01:05.0
+        ??? power
+        ?   ??? control
+        ?   ??? runtime_active_time
+        ?   ??? runtime_status
+        ?   ??? runtime_suspended_time
+        ?   ??? wakeup
+        ?   ??? wakeup_count
+        ??? subsystem -> ../../../../../../class/drm
+        ??? uevent
+
+    20 directories, 55 files
+
+
+Example virtual device view view showing the Translation Table Manager (ttm)
+graphics memory manager virtual device:
+
+    /sys/devices/virtual/drm
+    ??? ttm
+        ??? buffer_objects
+        ?   ??? bo_count
+        ??? memory_accounting
+        ?   ??? kernel
+        ?   ?   ??? available_memory
+        ?   ?   ??? emergency_memory
+        ?   ?   ??? swap_limit
+        ?   ?   ??? used_memory
+        ?   ?   ??? zone_memory
+        ?   ??? pool
+        ?       ??? pool_allocation_size
+        ?       ??? pool_max_size
+        ?       ??? pool_small_allocation
+        ??? power
+        ?   ??? control
+        ?   ??? runtime_active_time
+        ?   ??? runtime_status
+        ?   ??? runtime_suspended_time
+        ?   ??? wakeup
+        ?   ??? wakeup_count
+        ??? subsystem -> ../../../../class/drm
+        ??? uevent
+
+    7 directories, 16 files
+
+
+
+Where:		/sys/devices/<...>/drm/cardN/cardN-C-M/polled
+		For N a decimal system graphics adapter number: 0, 1, 2, ...
+		For C a connector type name (including spaces) from the set:
+			Unknown
+			VGA
+			DVI-I
+			DVI-D
+			DVI-A
+			Composite
+			SVIDEO
+			LVDS
+			Component
+			9-pin DIN
+			DisplayPort
+			HDMI Type A
+			HDMI Type B
+			TV
+			Embedded DisplayPort
+		For M a decimal connector number for connectors of that type
+			over all the graphics adapters in the system: 1, 2, ...
+Date:		22 September 2010
+KernelVersion:	2.6.37
+Contact:	Andy Walls <awalls@md.metrocast.net>
+Description:
+		Manual control over DRM Kernel Mode Set (KMS) output connector
+		hotplug/connect/disconnect polling criteria.  The graphics
+		adapter drm driver (e.g. radeon, i915, nouveau) will detect
+		the available connectors on a graphics adapter and set polling
+		criteria flags for the connector to specify for what events the
+		0.1 Hz DRM KMS poll of the connector should look.
+
+		A read of the contents of this entry will show what flags are
+		available, with the names of flags that are set for the
+		connector enclosed in brackets:
+
+			# cat /sys/devices/.../drm/card0/card0-DVI-D-1/polled
+			[hotplug_detectable] connect disconnect
+
+		A write of flags names to this entry, will clear the current
+		flag settings and set the poll criteria flags for that
+		connector to those specified names:
+
+			# echo " disconnect  connect " > \
+				/sys/devices/.../drm/card0/card0-DVI-D-1/polled
+			# cat /sys/devices/.../drm/card0/card0-DVI-D-1/polled
+			hotplug_detectable [connect] [disconnect]
+
+			# echo > /sys/devices/.../drm/card0/card0-DVI-D-1/polled
+			# cat /sys/devices/.../drm/card0/card0-DVI-D-1/polled
+			hotplug_detectable connect disconnect
+
+		The flags have the following meanings in drm_crtc_helper.c:
+
+			hotplug_detectable:
+			   always attempt to detect connection status upon poll
+			   don't automatically set up another poll of connector
+
+			connect:
+			   attempt to detect "connect" events
+			   automatically set up another poll of connector
+
+			disconnect:
+			   attempt to detect "disconnect" events
+			   automatically set up another poll of connector
+
+		Clearing all three flags will disable any detection actions
+		being taken for that connector during the 0.1 Hz poll.
