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[Bug 1395284] [NEW] Unstable wireless connections with 802.11n and kernel 3.16

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Public bug reported:

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.

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 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.

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.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug package-from-proposed utopic

** Description changed:

- Using kernel 3.16 the wireless connections 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.
+ 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.
  
  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 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.
+ 
  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
+  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
+  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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https://bugs.launchpad.net/bugs/1395284

Title:
  Unstable wireless connections with 802.11n and kernel 3.16

Status in “linux” package in Ubuntu:
  Confirmed

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 connect again. And so on.

  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 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.

  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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