This was solved by dropping network-manager and using Wicd. After upgrade to 12.04, this is no longer a problem with network- manager.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/961626 Title: network-manager cannot hold connection Status in “network-manager” package in Ubuntu: Incomplete Bug description: New clean install of 32bit 11.10 gnome classic. Connection becomes unresponsive regularly, and has to be reestablished using network-manager applet. ProblemType: Bug DistroRelease: Ubuntu 11.10 Package: network-manager 0.9.1.90-0ubuntu5.1 ProcVersionSignature: Ubuntu 3.0.0-16.29-generic 3.0.20 Uname: Linux 3.0.0-16-generic i686 NonfreeKernelModules: fglrx ApportVersion: 1.23-0ubuntu4 Architecture: i386 CRDA: Error: [Errno 2] No such file or directory Date: Wed Mar 21 13:40:38 2012 Gconf: IfupdownConfig: auto lo iface lo inet loopback InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012) IpRoute: default via 192.168.0.1 dev eth0 proto static 169.254.0.0/16 dev eth0 scope link metric 1000 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.3 metric 1 IwConfig: lo no wireless extensions. eth0 no wireless extensions. Keyfiles: Error: [Errno 2] No such file or directory NetworkManager.state: [main] NetworkingEnabled=true WirelessEnabled=true WWANEnabled=true WimaxEnabled=true ProcEnviron: PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash RfKill: SourcePackage: network-manager UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/961626/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

