nm_dhcp_manager_handle_event() isn't called on ubuntu7.01

[代尔欣 <daierxin gmail com>]

Hi Dan,
   The NetworkManger-0.7.0 official release, on ubuntu7.01, the signal "Event" can't be sent successfully and nm_dhcp_manager_handle_event() isn't called. Then dhcp timeout. But the NetworkManager-0.7.0 r3202 works fine. Please give suggetsion debug this.
the log:
NetworkManager: <info>  Activation (eth0) Stage 2 of 5 (Device Configure) successful. 
NetworkManager: <info>  Activation (eth0) Stage 3 of 5 (IP Configure Start) scheduled. 
NetworkManager: <info>  Activation (eth0) Stage 2 of 5 (Device Configure) complete. 
NetworkManager: <info>  Activation (eth0) Stage 3 of 5 (IP Configure Start) started... 
NetworkManager: <info>  (eth0): device state change: 5 -> 7 
NetworkManager: <info>  Activation (eth0) Beginning DHCP transaction. 
NetworkManager: <info>  dhclient started with pid 5288 
NetworkManager: <info>  Activation (eth0) Stage 3 of 5 (IP Configure Start) complete. 
dhclient: Internet Systems Consortium DHCP Client V3.0.5
dhclient: Copyright 2004-2006 Internet Systems Consortium.
dhclient: All rights reserved.
dhclient: For info, please visit http://www.isc.org/sw/dhcp/
dhclient: 
dhclient: Listening on LPF/eth0/00:c0:9f:a3:72:38
dhclient: Sending on   LPF/eth0/00:c0:9f:a3:72:38
dhclient: Sending on   Socket/fallback
dhclient: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3
dhclient: DHCPOFFER from 192.168.1.1
dhclient: DHCPREQUEST on eth0 to 255.255.255.255 port 67
dhclient: DHCPACK from 192.168.1.1
dhclient: bound to 192.168.1.100 -- renewal in 3331 seconds.
NetworkManager: <info>  Device 'eth0' DHCP transaction took too long (>45s), stopping it. 
NetworkManager: <info>  eth0: canceled DHCP transaction, dhcp client pid 5288 
NetworkManager: <info>  Activation (eth0) Stage 4 of 5 (IP Configure Timeout) scheduled... 
NetworkManager: <info>  Activation (eth0) Stage 4 of 5 (IP Configure Timeout) started... 
NetworkManager: <info>  (eth0): device state change: 7 -> 9