8086:08b1 [Lenovo V570] Intel Wireless 7260 wifi stops working

[Asif Youssuff]

After several hours (generally) of being used, the wifi drops out unceremoniously and toggling the hardware radio switch on my machine does nothing to restore connectivity. After this occurs, I am unable to see any access points. Rebooting the machine solves the issue, until it happens again.

 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b1] (rev 73)
 Subsystem: Intel Corporation Dual Band Wireless-AC 7260 [8086:4070]

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-3.16.0-24-generic 3.16.0-24.32 [modified: boot/vmlinuz-3.16.0-24-generic]
ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
Uname: Linux 3.16.0-24-generic x86_64
ApportVersion: 2.14.7-0ubuntu10
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: asif 2478 F.... pulseaudio
CurrentDesktop: GNOME
Date: Fri Nov 7 14:11:07 2014
HibernationDevice: RESUME=UUID=53025272-1910-418a-9f4a-b6ac00a768f1
InstallationDate: Installed on 2014-11-01 (6 days ago)
InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Alpha amd64 (20141031)
MachineType: LENOVO 1066A9U
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-24-generic root=/dev/mapper/ubuntu--gnome--vg-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.16.0-24-generic N/A
 linux-backports-modules-3.16.0-24-generic N/A
 linux-firmware 1.138
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/27/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 44CN43WW
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Emerald Lake
dmi.board.vendor: LENOVO
dmi.board.version: FAB1
dmi.chassis.asset.tag: Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnLENOVO:bvr44CN43WW:bd10/27/2011:svnLENOVO:pn1066A9U:pvrLenovoV570:rvnLENOVO:rnEmeraldLake:rvrFAB1:cvnLENOVO:ct10:cvr0.1:
dmi.product.name: 1066A9U
dmi.product.version: Lenovo V570
dmi.sys.vendor: LENOVO

[Brad Figg (brad-figg)]

This change was made by a bot.

[penalvch (penalvch)]

Asif Youssuff, thank you for reporting this and helping make Ubuntu better. Could you please test the latest upstream kernel available from the very top line at the top of the page (the release names are irrelevant for testing in your release) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER

where VERSION-NUMBER is the version number of the kernel you tested exactly shown as:
kernel-fixed-upstream-3.18-rc3

This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description.

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER

Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding.

[penalvch (penalvch)]

Asif Youssuff, the next step is to fully reverse commit bisect from kernel 3.16 to 3.18-rc3 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

[Asif Youssuff (yoasif)]

Christopher,

I have a question about the reverse bisect process. It looks like you want me to download Linus' tree, checkout the 3.18-rc3 release, and mark it bad. However, I am unsure of which revision I should mark as "good" to correspond to the 3.16.0-24.32 kernel I reported the bug for.

The "mapping" is not present on http://people.canonical.com/~kernel/info/kernel-version-map.html so any assistance here would be extremely helpful.

Thanks!

[penalvch (penalvch)]

Asif Youssuff, I would just start with the earliest 3.16 mainline kernel available (v3.16-rc1).

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]