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[Bug 1417552] BootDmesg.txt


apport information

** Attachment added: "BootDmesg.txt"

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  iwlwifi 7260 loses connection, performance degrades

Status in linux package in Ubuntu:

Bug description:

  I have a Sony Vaio Pro 11 which has a intel 7260 wifi chip. I've had
  nothing but trouble with it (and from reading forums, I'm not alone).
  I file this bug to help fix issues.

  My findings with recent kernels: laptop has Ubuntu Vivid installed,
  which comes with the 3.18 kernel and 23.11.10 firmware. With the -10
  firmware, often the wifi doesn't even associate with the access point,
  while all other devices in the house can. When it does connect, the
  speed is fast for about 1 second (around 10 MB/s), en then drops to
  20-60 kbps, or loses connection altogether. With self-compiled
  3.19-rc6 (with latest iwlwifi-fixes merged) it's the same. I tried the
  23.12.10 firmware, but it is the same.

  When I switch to the 25.228.9 firmware, it is much better, however,
  speed still drops every now and then, but much less than with the -10
  firmware. Kernel version doesn't seem to matter much, firmware version
  seems to drive all variability.

  This problem is for both bands 2.4 GHz and 5 GHz.

  I can provide all debugging info you request. I will provide the minimum logging tonight when I get home.
  ApportVersion: 2.15.1-0ubuntu4
  Architecture: amd64
   /dev/snd/controlC1:  jos        2160 F.... pulseaudio
   /dev/snd/controlC0:  jos        2160 F.... pulseaudio
  CurrentDesktop: MATE
  DistroRelease: Ubuntu 15.04
  HibernationDevice: RESUME=UUID=29ac20b8-1469-4865-b42a-9c1e67ce0d81
  InstallationDate: Installed on 2015-01-27 (7 days ago)
  InstallationMedia: Ubuntu MATE 15.04 "Vivid Vervet" - Alpha2 amd64 (20150123)
  MachineType: Sony Corporation SVP1121D4E
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.18.0-12-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.18.0-12.13-generic 3.18.4
   linux-restricted-modules-3.18.0-12-generic N/A
   linux-backports-modules-3.18.0-12-generic  N/A
   linux-firmware                             1.141
  Tags:  vivid
  Uname: Linux 3.18.0-12-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin netdev plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 11/05/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: R1041V7
  dmi.board.asset.tag: N/A
  dmi.board.name: VAIO
  dmi.board.vendor: Sony Corporation
  dmi.board.version: N/A
  dmi.chassis.asset.tag: N/A
  dmi.chassis.type: 10
  dmi.chassis.vendor: Sony Corporation
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrR1041V7:bd11/05/2013:svnSonyCorporation:pnSVP1121D4E:pvrC60C907J:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
  dmi.product.name: SVP1121D4E
  dmi.product.version: C60C907J
  dmi.sys.vendor: Sony Corporation

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