I found package which is the source of the problem! Problem appears after upgrading network-manager package 0.9.4.0-0ubuntu4.2 to 0.9.4.0-0ubuntu4.3
So it seems to be not kernel bug, but it is a bug of the network- manager! Next step is to find out which changes were made to the network-manager package! -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1268556 Title: 8086:1502 [Fujitsu D3076-S1x] Ethernet disconnecting at boot and later Status in “linux” package in Ubuntu: Incomplete Bug description: Fresh install XUbuntu 12.04. After boot network interface is down. After unplugging and plugging back network cable, network is up and running again. Later (randomly) it may go off again. Again, unplugging and plugging back network cable helps. This bug is similar to https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1124040 Ethernet card is onboard Intel. Mainboard: FUJITSU D3076-S1 Same problem happens with onboard ethernet with Intel mainboard DH61BE. I have to buy and insert TP-LINK TG-3468 ethernet card (Realtek chipset). They work without problem. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: linux-image-3.2.0-58-generic 3.2.0-58.88 ProcVersionSignature: Ubuntu 3.2.0-58.88-generic 3.2.53 Uname: Linux 3.2.0-58-generic x86_64 NonfreeKernelModules: nvidia AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. ApportVersion: 2.0.1-0ubuntu17.6 Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: CONEXANT Analog [CONEXANT Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: user 1641 F.... xfce4-volumed user 1718 F.... pulseaudio /dev/snd/controlC0: user 1641 F.... xfce4-volumed user 1718 F.... pulseaudio CRDA: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden Card0.Amixer.info: Card hw:0 'PCH'/'HDA Intel PCH at 0xfb220000 irq 50' Mixer name : 'Conexant CX20642' Components : 'HDA:14f150a2,173411b0,00100100' Controls : 19 Simple ctrls : 9 Card1.Amixer.info: Card hw:1 'NVidia'/'HDA NVidia at 0xfb080000 irq 17' Mixer name : 'Nvidia GPU 42 HDMI/DP' Components : 'HDA:10de0042,10de094a,00100100' Controls : 12 Simple ctrls : 2 Date: Mon Jan 13 12:02:04 2014 HibernationDevice: RESUME=UUID=324bb3ce-d9ee-4142-a94d-1382ec436191 InstallationMedia: Xubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130822) IwConfig: lo no wireless extensions. eth1 no wireless extensions. eth0 no wireless extensions. MachineType: FUJITSU D3076-S1 MarkForUpload: True ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-58-generic root=UUID=2d4ccd09-d6c3-47ee-80ad-14977144d770 ro quiet splash RelatedPackageVersions: linux-restricted-modules-3.2.0-58-generic N/A linux-backports-modules-3.2.0-58-generic N/A linux-firmware 1.79.9 RfKill: SourcePackage: linux StagingDrivers: mei UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/20/2012 dmi.bios.vendor: FUJITSU // American Megatrends Inc. dmi.bios.version: V4.6.4.0 R1.12.0 for D3076-S1x dmi.board.name: D3076-S1 dmi.board.vendor: FUJITSU dmi.board.version: S26361-D3076-S1 dmi.chassis.type: 6 dmi.chassis.vendor: FUJITSU dmi.modalias: dmi:bvnFUJITSU//AmericanMegatrendsInc.:bvrV4.6.4.0R1.12.0forD3076-S1x:bd09/20/2012:svnFUJITSU:pnD3076-S1:pvr:rvnFUJITSU:rnD3076-S1:rvrS26361-D3076-S1:cvnFUJITSU:ct6:cvr: dmi.product.name: D3076-S1 dmi.sys.vendor: FUJITSU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1268556/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp