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[Bug 1450856] Re: Wifi stops working with "bandwidth change" (Intel Centrino Wireless-N 1030 [Rainbow Peak])

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apport information

** Tags added: apport-collected

** Description changed:

  I have a Dell XPS 15 L502X with Intel Centrino Wireless-N 1030 [Rainbow Peak] running Ubuntu 14.04 (fresh install). Wifi stops working intermittently during active usage and *always* after screen off. Syslog shows this message just before it happens: 
  kernel: [ 4832.867113] wlan0: AP XX:XX:XX:XX:XX:XX changed bandwidth, new config is 2412 MHz, width 1 (2412/0 MHz)
  
  This happens regularly. I have tried some tweaks suggested to users facing wifi problems in Ubuntu 14.04. My iwlwifi.conf is this:
  # /etc/modprobe.d/iwlwifi.conf
  options iwlwifi bt_coex_active=0 swcrypto=1 11n_disable=8
  
  This does not solve the issue.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-firmware 1.127.11
  ProcVersionSignature: Ubuntu 3.16.0-36.48~14.04.1-generic 3.16.7-ckt9
  Uname: Linux 3.16.0-36-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.10
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Fri May  1 22:09:35 2015
  Dependencies:
   
  InstallationDate: Installed on 2015-04-12 (19 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  PackageArchitecture: all
  SourcePackage: linux-firmware
  UpgradeStatus: No upgrade log present (probably fresh install)
+ --- 
+ ApportVersion: 2.14.1-0ubuntu3.10
+ Architecture: amd64
+ AudioDevicesInUse:
+  USER        PID ACCESS COMMAND
+  /dev/snd/pcmC0D0p:   saad       2138 F...m pulseaudio
+  /dev/snd/controlC0:  saad       2138 F.... pulseaudio
+ CurrentDesktop: Unity
+ DistroRelease: Ubuntu 14.04
+ HibernationDevice: RESUME=UUID=3d498343-390a-472c-b30a-258912288990
+ InstallationDate: Installed on 2015-04-12 (23 days ago)
+ InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
+ MachineType: Dell Inc. Dell System XPS L502X
+ Package: linux (not installed)
+ ProcFB: 0 inteldrmfb
+ ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-36-generic root=UUID=c08627eb-2d07-48bb-996b-139cb4723737 ro quiet splash vt.handoff=7
+ ProcVersionSignature: Ubuntu 3.16.0-36.48~14.04.1-generic 3.16.7-ckt9
+ RelatedPackageVersions:
+  linux-restricted-modules-3.16.0-36-generic N/A
+  linux-backports-modules-3.16.0-36-generic  N/A
+  linux-firmware                             1.127.11
+ Tags:  trusty
+ Uname: Linux 3.16.0-36-generic x86_64
+ UpgradeStatus: No upgrade log present (probably fresh install)
+ UserGroups: adm bumblebee cdrom debian-tor dip lpadmin plugdev sambashare sudo
+ _MarkForUpload: True
+ dmi.bios.date: 05/29/2012
+ dmi.bios.vendor: Dell Inc.
+ dmi.bios.version: A11
+ dmi.board.name: 0NJT03
+ 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.:bvrA11:bd05/29/2012:svnDellInc.:pnDellSystemXPSL502X:pvr:rvnDellInc.:rn0NJT03:rvrA00:cvnDellInc.:ct8:cvr0.1:
+ dmi.product.name: Dell System XPS L502X
+ dmi.sys.vendor: Dell Inc.

** Attachment added: "AlsaInfo.txt"
   https://bugs.launchpad.net/bugs/1450856/+attachment/4391540/+files/AlsaInfo.txt

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https://bugs.launchpad.net/bugs/1450856

Title:
  Wifi stops working with "bandwidth change" (Intel Centrino Wireless-N
  1030 [Rainbow Peak])

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I have a Dell XPS 15 L502X with Intel Centrino Wireless-N 1030 [Rainbow Peak] running Ubuntu 14.04 (fresh install). Wifi stops working intermittently during active usage and *always* after screen off. Syslog shows this message just before it happens: 
  kernel: [ 4832.867113] wlan0: AP XX:XX:XX:XX:XX:XX changed bandwidth, new config is 2412 MHz, width 1 (2412/0 MHz)

  This happens regularly. I have tried some tweaks suggested to users facing wifi problems in Ubuntu 14.04. My iwlwifi.conf is this:
  # /etc/modprobe.d/iwlwifi.conf
  options iwlwifi bt_coex_active=0 swcrypto=1 11n_disable=8

  This does not solve the issue.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-firmware 1.127.11
  ProcVersionSignature: Ubuntu 3.16.0-36.48~14.04.1-generic 3.16.7-ckt9
  Uname: Linux 3.16.0-36-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.10
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Fri May  1 22:09:35 2015
  Dependencies:
   
  InstallationDate: Installed on 2015-04-12 (19 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  PackageArchitecture: all
  SourcePackage: linux-firmware
  UpgradeStatus: No upgrade log present (probably fresh install)
  --- 
  ApportVersion: 2.14.1-0ubuntu3.10
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0p:   saad       2138 F...m pulseaudio
   /dev/snd/controlC0:  saad       2138 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=3d498343-390a-472c-b30a-258912288990
  InstallationDate: Installed on 2015-04-12 (23 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  MachineType: Dell Inc. Dell System XPS L502X
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-36-generic root=UUID=c08627eb-2d07-48bb-996b-139cb4723737 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-36.48~14.04.1-generic 3.16.7-ckt9
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-36-generic N/A
   linux-backports-modules-3.16.0-36-generic  N/A
   linux-firmware                             1.127.11
  Tags:  trusty
  Uname: Linux 3.16.0-36-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm bumblebee cdrom debian-tor dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 05/29/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A11
  dmi.board.name: 0NJT03
  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.:bvrA11:bd05/29/2012:svnDellInc.:pnDellSystemXPSL502X:pvr:rvnDellInc.:rn0NJT03:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L502X
  dmi.sys.vendor: Dell Inc.

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References

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