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0e1f616
(Get the code!)
I don't think this is a duplicate of bug #45696. I'm having the same problem without any suspend to RAM or hibernation actions.
NetworkManager started showing this behaviour right after I ticked off my Atheros wifi card from the Restricted Driver Manager, just to see what would happen. Since then, even after adding it back to restricted drivers manager, *any* wifi card I try eventually gets the same DHCP release, after which I'm forced to reconnect (~every 1/2 minutes).
After association to *any* AP, there is a communication failure between the driver and NetworkManager; I can tell, because although ifconfig returns a proper IP address, the "Connection Information" in nm-applet shows 0s all around.
I suppose that, because it figures the DHCP didn't provide an IP address, NetworkManager eventually releases the request. (note that it remain associated to the AP for a period of time, and only after a few times does it disconnect from the AP)
I'm running the Gutsy beta on a Toshiba Portege R200.
uname -a:
Linux r200-ubuntu 2.6.22-12-386 #1 Sun Sep 23 17:37:35 GMT 2007 i686 GNU/Linux
lspci | grep Ethernet
01:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8053 PCI-E Gigabit Ethernet Controller (rev 15)
02:05.0 Ethernet controller: Atheros Communications, Inc. AR5212/AR5213 Multiprotocol MAC/baseband processor (rev 01)
This is what the relevant DHCP release information (see syslog attachment):
Oct 3 13:57:05 r200-ubuntu dhclient: bound to 192.168.1.102 -- renewal in 956038622 seconds.
Oct 3 13:58:38 r200-ubuntu NetworkManager: <info> Device 'ath0' DHCP transaction took too long (>99s), stopping it.
Oct 3 13:58:38 r200-ubuntu dhclient: There is already a pid file /var/run/
Oct 3 13:58:38 r200-ubuntu dhclient: killed old client process, removed PID file
Oct 3 13:58:38 r200-ubuntu dhclient: wifi0: unknown hardware address type 801
Oct 3 13:58:38 r200-ubuntu dhclient: wifi0: unknown hardware address type 801
Oct 3 13:58:38 r200-ubuntu dhclient: DHCPRELEASE on ath0 to 192.168.1.1 port 67
Oct 3 13:58:38 r200-ubuntu avahi-daemon[5134]: Withdrawing address record for 192.168.1.102 on ath0.