I cannot adjust WiFi network parameters to see whether this would affect the reproducibility of the bug. However here are more details about network's parameters:
4b) WPA2-PSK 4c) No MAC filtering 4d) No QoS AFAIK 4e) I don't think the router exposes the beacon interval value at all 4f) I didn't enable any firewall on the router 4g) The problem has happened on several channels. 5) At least 4 other WiFi devices do not have problems like this one. 6) The distance to AP was about 3-4 meters 7) The only "obstruction" was a wooden shelf with big holes like this one http://www.ikea.com/de/de/catalog/products/30275861/ 7a) I could not test this 8) I do not see this problem at work with Cisco APs, however we don't get a big competition for channels at work. There are a lot of different private APs visible in my apartment. 9) I have never tried that with previous releases. I do not have the option to try. 10) Since I have already tried the latest 3.19-rc1 kernel, I don't see the point to test compat-wireless 11) Yes, it occurs in 3.19-rc1 13) I will try the ndiswrapper later. 16) I'm using linux-firmware 1.138. I haven't tried the previous version. Latest Intel firmware is from 3/25/2014, I assume it's already included in linux-firmware 1.138. ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- 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/1405437 Title: [Dell Precision M4800] iwlwifi regularly loses connection on Intel 7260 Status in linux package in Ubuntu: Confirmed Bug description: About every 10 minutes my WiFi disconnects and a line like this appears in syslog: Dec 24 11:31:31 work kernel: [ 2721.017478] wlan0: deauthenticated from 10:c6:1f:2c:49:56 (Reason: 7=CLASS3_FRAME_FROM_NONASSOC_STA) It is accompanied later by such line: Dec 24 11:31:46 work NetworkManager[902]: <info> (wlan0): device state change: activated -> failed (reason 'SSID not found') [100 120 53] The network disappears from the list and only becomes visible after I disable and re-enable networking via the network applet. I don't remember seeing this problem at work where they use Cisco routers. I see the problem at home with my Speedport 723V Typ A router (a+b+n mode, WPA2). This may be affected by number of other wifi networks which are visible here: at least 17 at the moment. 03:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b1] (rev 73) Subsystem: Intel Corporation Dual Band Wireless-AC 7260 [8086:4470] WORKAROUND: /etc/modprobe.d/iwlwifi.conf : options iwlwifi 11n_disable=1 Drops did not cause loss of my network, and reconnects happened mostly in the same second. However at some moments there were just too many drops. ProblemType: Bug DistroRelease: Ubuntu 14.10 Package: linux-image-3.16.0-28-generic 3.16.0-28.38 ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1 Uname: Linux 3.16.0-28-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.14.7-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: treguben 2520 F.... pulseaudio /dev/snd/controlC0: treguben 2520 F.... pulseaudio CurrentDesktop: Unity Date: Wed Dec 24 15:06:25 2014 HibernationDevice: RESUME=UUID=82445dd2-3bcf-42f7-ae59-4fba694e25de InstallationDate: Installed on 2014-12-11 (12 days ago) InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1) MachineType: Dell Inc. Precision M4800 ProcFB: 0 EFI VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-28-generic.efi.signed root=UUID=9a116abe-59b9-48b8-abe4-5064a191ac51 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.16.0-28-generic N/A linux-backports-modules-3.16.0-28-generic N/A linux-firmware 1.138 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/03/2014 dmi.bios.vendor: Dell Inc. dmi.bios.version: A11 dmi.board.name: 0T3YTY dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA11:bd12/03/2014:svnDellInc.:pnPrecisionM4800:pvr01:rvnDellInc.:rn0T3YTY:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Precision M4800 dmi.product.version: 01 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1405437/+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