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[Pavel <pavel.sa@xxxxxxxxxx>]

Christopher, I have tried the last upstream kernel v4.0-rc3-vivid using
the iwlwifi-7260-9.ucode and the latest iwlwifi-7260-12.ucode firmware.

Unfortunately the problem of varying connection speed persists with the
iwlwifi-7260-12.ucode firmware which I got from the package linux-
firmware_1.143. It seems the situation is ok (like in ubuntu kernel
3.13.0-40.69) with older iwlwifi-7260-9.ucode firmware which on the
other hand cause the dmesg | grep iw:

[    1.232620] iwlwifi 0000:04:00.0: enabling device (0000 -> 0002)
[    1.236731] iwlwifi 0000:04:00.0: Unsupported splx structure
[    1.239633] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-7260-12.ucode failed with error -2
[    1.239647] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-7260-11.ucode failed with error -2
[    1.239654] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-7260-10.ucode failed with error -2
[    1.239656] iwlwifi 0000:04:00.0: request for firmware file 'iwlwifi-7260-10.ucode' failed.
[    1.247423] iwlwifi 0000:04:00.0: Firmware has old API version, expected v10 through v12, got v9.
[    1.247449] iwlwifi 0000:04:00.0: New firmware can be obtained from http://www.intellinuxwireless.org/.
[    1.247598] iwlwifi 0000:04:00.0: loaded firmware version 25.228.9.0 op_mode iwlmvm
[    1.330278] iwlwifi 0000:04:00.0: Detected Intel(R) Dual Band Wireless AC 7260, REV=0x144
[    1.330407] iwlwifi 0000:04:00.0: L1 Disabled - LTR Enabled
[    1.330665] iwlwifi 0000:04:00.0: L1 Disabled - LTR Enabled
[    1.549345] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
[    2.320167] iwlwifi 0000:04:00.0: L1 Disabled - LTR Enabled
[    2.320391] iwlwifi 0000:04:00.0: L1 Disabled - LTR Enabled

the "iw dev wlan0 link" shows:

freq: 2462
        RX: 1740056701 bytes (1144216 packets)
        TX: 44916002 bytes (356171 packets)
        signal: -51 dBm
        tx bitrate: 65.0 MBit/s MCS 7

        bss flags:      short-slot-time
        dtim period:    1
        beacon int:     100

where the signal with older iwlwifi-7260-9.ucode firmware keeps between
(-40dBm ; -51dBm) while with iwlwifi-7260-12.ucode jumps between (-40dBm
; -99 dBm)

Please let me know if there is anything else I can do to help with this
issue.

Thank you.

Pavel

-- 
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/1412217

Title:
  Intel® Dual Band Wireless-AC 7260 drops the connection

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hi I am using Xubuntu 14.04.1 with wifi card Intel® Dual Band
  Wireless-AC 7260. From time to time my WiFi connection speed drops,
  or disconnects (wpa2, 2.4GHz). This happens on kernels higher than
  3.0.13-40.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-44-generic 3.13.0-44.73
  ProcVersionSignature: Ubuntu 3.13.0-44.73-generic 3.13.11-ckt12
  Uname: Linux 3.13.0-44-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  isvoboda   1885 F.... pulseaudio
   /dev/snd/controlC0:  isvoboda   1885 F.... pulseaudio
   /dev/snd/pcmC0D0p:   isvoboda   1885 F...m pulseaudio
  CurrentDesktop: XFCE
  Date: Sun Jan 18 18:04:49 2015
  InstallationDate: Installed on 2014-09-30 (109 days ago)
  InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140723)
  MachineType: MSI MS-7851
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-44-generic.efi.signed root=UUID=b6e4afa1-c663-4dd8-98fc-69d94dcae276 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-44-generic N/A
   linux-backports-modules-3.13.0-44-generic  N/A
   linux-firmware                             1.127.11
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/21/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V5.5
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: H97I AC (MS-7851)
  dmi.board.vendor: MSI
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To be filled by O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MSI
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV5.5:bd11/21/2014:svnMSI:pnMS-7851:pvr1.0:rvnMSI:rnH97IAC(MS-7851):rvr1.0:cvnMSI:ct3:cvr1.0:
  dmi.product.name: MS-7851
  dmi.product.version: 1.0
  dmi.sys.vendor: MSI

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