Giovanni, thank you for reporting this and helping make Ubuntu better. The next step is to fully reverse commit bisect from kernel 3.16 to 3.18-rc5 in order to identify the last bad commit, followed immediately by the first good one. Once this commit has been identified, then it may be reviewed as a candidate for backporting into your release. Could you please do this following https://wiki.ubuntu.com/Kernel/KernelBisection#How_do_I_reverse_bisect_the_upstream_kernel.3F ? Please note, finding adjacent kernel versions is not fully commit bisecting.
Thank you for your understanding. Helpful bug reporting tips: https://wiki.ubuntu.com/ReportingBugs ** Tags added: kernel-fixed-upstream kernel-fixed-upstream-3.18-rc5 latest-bios-a10 needs-reverse-bisect ** Tags added: regression-release ** Description changed: Using kernel 3.16 the wireless connections on 802.11n networks are very unstable and they fail after few minutes. Even if the NetworkManager says that it is still connected, nothing works and I have to manually - disconnect and connect again. And so on. + disconnect and re-connect. - The problem was not present in kernel 3.14 (i.e. in Ubuntu 14.04) and - seems to be resolved in 3.18-rc5, even if in this case the connections - seem to be slower (but stable). + The problem was not present in in Ubuntu 14.04 and seems to be resolved + in 3.18-rc5, even if in this case the connections seem to be slower (but + stable). - The solution (or better, the workaround) that has been proposed in - askubuntu does not work for me ( http://askubuntu.com/questions/544074 - /unstable-wireless-in-ubuntu-14-10 ). - - I have no problem with older wifi standard: if I set my router to not - use the 11n standard, it works perfectly. + WORKAROUND: Use 802.11g. ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: linux-image-3.16.0-25-generic 3.16.0-25.33 ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7 Uname: Linux 3.16.0-25-generic x86_64 ApportVersion: 2.14.7-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: giovanni 2688 F.... pulseaudio /dev/snd/controlC0: giovanni 2688 F.... pulseaudio CurrentDesktop: Unity Date: Sat Nov 22 10:37:46 2014 HibernationDevice: RESUME=UUID=baeb85bd-8e5b-442a-8850-5335ad563c98 InstallationDate: Installed on 2014-10-06 (46 days ago) InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2) MachineType: Dell Inc. Inspiron 7537 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-25-generic.efi.signed root=UUID=e4cc7fd4-702d-44e9-ac9b-8bd4c776c85c ro quiet splash acpi_osi=Linux vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.16.0-25-generic N/A linux-backports-modules-3.16.0-25-generic N/A linux-firmware 1.138 SourcePackage: linux UpgradeStatus: Upgraded to utopic on 2014-10-30 (22 days ago) WifiSyslog: Nov 22 10:37:21 inspiron kernel: [ 940.511342] mmc0: card d555 removed dmi.bios.date: 07/18/2014 dmi.bios.vendor: Dell Inc. dmi.bios.version: A10 dmi.board.name: 038M0M dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: 0.1 dmi.modalias: dmi:bvnDellInc.:bvrA10:bd07/18/2014:svnDellInc.:pnInspiron7537:pvr:rvnDellInc.:rn038M0M:rvrA00:cvnDellInc.:ct8:cvr0.1: dmi.product.name: Inspiron 7537 dmi.sys.vendor: Dell Inc. ** Changed in: linux (Ubuntu) Importance: Undecided => Low ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- 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/1395284 Title: Unstable wireless connections with 802.11n and kernel 3.16 Status in “linux” package in Ubuntu: Incomplete Bug description: Using kernel 3.16 the wireless connections on 802.11n networks are very unstable and they fail after few minutes. Even if the NetworkManager says that it is still connected, nothing works and I have to manually disconnect and re-connect. The problem was not present in in Ubuntu 14.04 and seems to be resolved in 3.18-rc5, even if in this case the connections seem to be slower (but stable). WORKAROUND: Use 802.11g. ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: linux-image-3.16.0-25-generic 3.16.0-25.33 ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7 Uname: Linux 3.16.0-25-generic x86_64 ApportVersion: 2.14.7-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: giovanni 2688 F.... pulseaudio /dev/snd/controlC0: giovanni 2688 F.... pulseaudio CurrentDesktop: Unity Date: Sat Nov 22 10:37:46 2014 HibernationDevice: RESUME=UUID=baeb85bd-8e5b-442a-8850-5335ad563c98 InstallationDate: Installed on 2014-10-06 (46 days ago) InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2) MachineType: Dell Inc. Inspiron 7537 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-25-generic.efi.signed root=UUID=e4cc7fd4-702d-44e9-ac9b-8bd4c776c85c ro quiet splash acpi_osi=Linux vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.16.0-25-generic N/A linux-backports-modules-3.16.0-25-generic N/A linux-firmware 1.138 SourcePackage: linux UpgradeStatus: Upgraded to utopic on 2014-10-30 (22 days ago) WifiSyslog: Nov 22 10:37:21 inspiron kernel: [ 940.511342] mmc0: card d555 removed dmi.bios.date: 07/18/2014 dmi.bios.vendor: Dell Inc. dmi.bios.version: A10 dmi.board.name: 038M0M dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: 0.1 dmi.modalias: dmi:bvnDellInc.:bvrA10:bd07/18/2014:svnDellInc.:pnInspiron7537:pvr:rvnDellInc.:rn038M0M:rvrA00:cvnDellInc.:ct8:cvr0.1: dmi.product.name: Inspiron 7537 dmi.sys.vendor: Dell Inc. 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