Reduced HOST_DEVICE_SETTLE_DELAY_MS to 1000ms down from 1500ms to improve device compatibility while in USB Host mode, as some devices will drop off the USB bus if no connection is made within a timeout period.

LUFA/Drivers/USB/LowLevel/Host.h

@@ -95,10 +95,11 @@
 				 *  after connection before the enumeration process can start or incorrect operation will
 				 *  occur.
 				 *
-				 *  This value may be overridden in the user project makefile as the value of the 
-				 *  HOST_DEVICE_SETTLE_DELAY_MS token, and passed to the compiler using the -D switch.
+				 *  The default delay value may be overridden in the user project makefile by definining the
+				 *  HOST_DEVICE_SETTLE_DELAY_MS token to tbe required delay in milliseconds, and passed to the
+				 *  compiler using the -D switch.
 				 */
-				#define HOST_DEVICE_SETTLE_DELAY_MS        1500
+				#define HOST_DEVICE_SETTLE_DELAY_MS        1000
 			#endif
 
 		/* Enums: */

LUFA/ManPages/ChangeLog.txt

@@ -28,6 +28,7 @@
   *    not break communications with the host by exceeding the maximum control request stage timeout period
   *  - Changed the signature of the CALLBACK_USB_GetDescriptor() callback function so that the descriptor pointer is const, to remove
   *    the need for extra casting inside the callback (thanks to Jonathan Kollasch)
+  *  - Reduced HOST_DEVICE_SETTLE_DELAY_MS to 1000ms down from 1500ms to improve device compatibility while in USB Host mode
   *
   *  <b>Fixed:</b>
   *  - Fixed USB_GetHIDReportItemInfo() function modifying the given report item's data when the report item does not exist