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[Gilles Duboscq <gilwooden@xxxxxxxxx>]

FYI, this also affects Fedora (tested with Fedora 21, kernel 3.18.7)

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https://bugs.launchpad.net/bugs/1413694

Title:
  Since 3.18.x, iwlwifi has severe connection problems

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  after the switch to 3.18, the wifi connection drops very often (50% of
  the time or more). dmesg | grep iwlwifi:

  erik@XPS12-9Q33:~$ dmesg | grep iwlwifi
  [    7.026062] iwlwifi 0000:06:00.0: enabling device (0000 -> 0002)
  [    7.026551] iwlwifi 0000:06:00.0: irq 45 for MSI/MSI-X
  [    7.032559] iwlwifi 0000:06:00.0: loaded firmware version 23.11.10.0 op_mode iwlmvm
  [    7.061571] iwlwifi 0000:06:00.0: Detected Intel(R) Dual Band Wireless AC 7260, REV=0x144
  [    7.061906] iwlwifi 0000:06:00.0: L1 Enabled - LTR Enabled
  [    7.062376] iwlwifi 0000:06:00.0: L1 Enabled - LTR Enabled
  [    8.428473] iwlwifi 0000:06:00.0: L1 Enabled - LTR Enabled
  [    8.428976] iwlwifi 0000:06:00.0: L1 Enabled - LTR Enabled
  [ 1062.829041] iwlwifi 0000:06:00.0: fail to flush all tx fifo queues Q 0
  [ 1062.830289] iwlwifi 0000:06:00.0: Current SW read_ptr 100 write_ptr 101
  [ 1062.832187] iwlwifi 0000:06:00.0: FH TRBs(0) = 0x8000300d
  [ 1062.833307] iwlwifi 0000:06:00.0: FH TRBs(1) = 0xc01100c0
  [ 1062.834239] iwlwifi 0000:06:00.0: FH TRBs(2) = 0x00000000
  [ 1062.835165] iwlwifi 0000:06:00.0: FH TRBs(3) = 0x80300064
  [ 1062.836090] iwlwifi 0000:06:00.0: FH TRBs(4) = 0x00000000
  [ 1062.837006] iwlwifi 0000:06:00.0: FH TRBs(5) = 0x00000000
  [ 1062.837933] iwlwifi 0000:06:00.0: FH TRBs(6) = 0x00000000
  [ 1062.838821] iwlwifi 0000:06:00.0: FH TRBs(7) = 0x00709090
  [ 1062.839737] iwlwifi 0000:06:00.0: Q 0 is active and mapped to fifo 3 ra_tid 0x0000 [100,101]
  [ 1062.840675] iwlwifi 0000:06:00.0: Q 1 is active and mapped to fifo 2 ra_tid 0x0000 [0,0]
  [ 1062.841915] iwlwifi 0000:06:00.0: Q 2 is active and mapped to fifo 1 ra_tid 0x0000 [84,84]
  [ 1062.842836] iwlwifi 0000:06:00.0: Q 3 is active and mapped to fifo 0 ra_tid 0x0000 [14,14]
  [ 1062.843777] iwlwifi 0000:06:00.0: Q 4 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
  [ 1062.844695] iwlwifi 0000:06:00.0: Q 5 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
  [ 1062.845917] iwlwifi 0000:06:00.0: Q 6 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
  [ 1062.846825] iwlwifi 0000:06:00.0: Q 7 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
  [ 1062.847723] iwlwifi 0000:06:00.0: Q 8 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
  [ 1062.848612] iwlwifi 0000:06:00.0: Q 9 is active and mapped to fifo 7 ra_tid 0x0000 [145,145]
  [ 1062.849812] iwlwifi 0000:06:00.0: Q 10 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
  [ 1062.850707] iwlwifi 0000:06:00.0: Q 11 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
  [ 1062.851601] iwlwifi 0000:06:00.0: Q 12 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
  [ 1062.852484] iwlwifi 0000:06:00.0: Q 13 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
  [ 1062.853673] iwlwifi 0000:06:00.0: Q 14 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
  [ 1062.854539] iwlwifi 0000:06:00.0: Q 15 is active and mapped to fifo 5 ra_tid 0x0000 [0,0]
  [ 1062.855739] iwlwifi 0000:06:00.0: Q 16 is active and mapped to fifo 1 ra_tid 0x0000 [177,219]
  [ 1062.856623] iwlwifi 0000:06:00.0: Q 17 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
  [ 1062.857829] iwlwifi 0000:06:00.0: Q 18 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]
  [ 1062.858725] iwlwifi 0000:06:00.0: Q 19 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0]

  DS Parameter set: channel 13
          DS Parameter set: channel 1
          DS Parameter set: channel 1
          DS Parameter set: channel 1
          DS Parameter set: channel 6
          DS Parameter set: channel 6
          DS Parameter set: channel 11
          DS Parameter set: channel 13

  several APs from different manufacturers are used, no difference

  WPA2-PSK is used

  version.log:
  Ubuntu 3.18.0-9.10-generic 3.18.2

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.18.0-9-generic 3.18.0-9.10
  ProcVersionSignature: Ubuntu 3.18.0-9.10-generic 3.18.2
  Uname: Linux 3.18.0-9-generic x86_64
  ApportVersion: 2.15.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  erik       8523 F.... pulseaudio
   /dev/snd/controlC0:  erik       8523 F.... pulseaudio
  CurrentDesktop: LXQt
  Date: Thu Jan 22 19:26:18 2015
  HibernationDevice: RESUME=UUID=ad769441-bb4d-4be0-9cac-5d014f883d3f
  InstallationDate: Installed on 2014-09-14 (130 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140914)
  MachineType: Dell Inc. XPS 12-9Q33
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: \boot\vmlinuz-3.18.0-9-generic.efi.signed ro root=UUID=1551b59c-7fbd-40f7-95c4-47d5359b39dc initrd=boot\initrd.img-3.18.0-9-generic
  RelatedPackageVersions:
   linux-restricted-modules-3.18.0-9-generic N/A
   linux-backports-modules-3.18.0-9-generic  N/A
   linux-firmware                            1.141
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/15/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A06
  dmi.board.name: XPS 12-9Q33
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A06
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvrA06:bd04/15/2014:svnDellInc.:pnXPS12-9Q33:pvrA06:rvnDellInc.:rnXPS12-9Q33:rvrA06:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: XPS 12-9Q33
  dmi.product.version: A06
  dmi.sys.vendor: Dell Inc.

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