Adding Linux here, as it seems like the serial ports disappears in the logs in the referred Debian bug report.
** Also affects: linux (Ubuntu) Importance: Undecided Status: New -- 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/1071853 Title: Huawei K3565 Rev 2: Randomly disconnects from mobile broadband network and behaves as if USB modem physically disconnected Status in “linux” package in Ubuntu: New Status in “modemmanager” package in Ubuntu: Incomplete Status in “network-manager” package in Ubuntu: New Status in “modemmanager” package in Debian: New Bug description: I connect to a mobile broadband network through a Huawei USB 3G modem. I stay connected all the time. Every once in a while, with almost systematic periodicity (like every 20-30 minutes), without any apparent reason, whether or not I am using the network or not, the nonnection suddenly goes down, and: - the indicator shows I'm disconnected, the - the mobile broadband networks (I have two of them configured, though I only use one now) disappear from the list in nm-applet - The option "Enable Mobile Broadband" at the bottom of the nm-applet menu DISAPPEARS (not that it gets unchecked, it _disappears_ completely) In order to reconnect I have to unplug and replug the usb modem, wait a few seconds for it to be initialized or whatever, and then reconnect via the nm-applet (when the nm-applet doesn't become unresponsive because of another old known bug). All the symptoms are EXACTLY as if someone had suddenly unplogged the modem physically, so this may as well be a usb problem. I have no idea what logs I should look for and attach. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: network-manager 0.9.4.0-0ubuntu4.2 ProcVersionSignature: Ubuntu 3.2.0-33.52-generic 3.2.31 Uname: Linux 3.2.0-33-generic i686 NonfreeKernelModules: nvidia ApportVersion: 2.0.1-0ubuntu14 Architecture: i386 Date: Fri Oct 26 20:10:24 2012 IfupdownConfig: auto lo iface lo inet loopback InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429) IpRoute: default via 10.64.64.64 dev ppp0 proto static 10.64.64.64 dev ppp0 proto kernel scope link src 77.210.172.228 169.254.0.0/16 dev ppp0 scope link metric 1000 NetworkManager.state: [main] NetworkingEnabled=true WirelessEnabled=true WWANEnabled=true ProcEnviron: TERM=xterm PATH=(custom, user) LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: network-manager UpgradeStatus: Upgraded to precise on 2012-05-17 (162 days ago) mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2012-08-30T13:38:55.126319 nmcli-dev: DEVICE TYPE STATE DBUS-PATH ttyUSB0 gsm connected /org/freedesktop/NetworkManager/Devices/19 wlan0 802-11-wireless disconnected /org/freedesktop/NetworkManager/Devices/1 eth0 802-3-ethernet unavailable /org/freedesktop/NetworkManager/Devices/0 nmcli-nm: RUNNING VERSION STATE NET-ENABLED WIFI-HARDWARE WIFI WWAN-HARDWARE WWAN running 0.9.4.0 connected enabled enabled enabled enabled enabled --- ApportVersion: 2.0.1-0ubuntu14 Architecture: i386 DistroRelease: Ubuntu 12.04 InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429) NonfreeKernelModules: nvidia Package: network-manager PackageArchitecture: i386 ProcEnviron: TERM=xterm PATH=(custom, user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcVersionSignature: Ubuntu 3.2.0-33.52-generic 3.2.31 Tags: precise running-unity Uname: Linux 3.2.0-33-generic i686 UpgradeStatus: Upgraded to precise on 2012-05-17 (163 days ago) UserGroups: adm admin audio cdrom dialout lpadmin netdev plugdev sambashare vboxusers video To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1071853/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp