kernel-packages team mailing list archive

[Michael Vorburger <1427431@xxxxxxxxxxxxxxxxxx>]

Downloading one "big" (20 MB) file seems to "trigger" this, and I'll get
the "Tx excessive retries:2  Invalid misc:383   Missed beacon:0". Those
"mac retries" (wavemon) may be unrelated? It stayed at just 2 with this
attempt to reproduce. The Invalid misc:383 I saw in "iwconfig wlan0"
after DL seems to reset itself down after a few min, e.g. now back to
22.

Attached is the wifi-debug-files.tar.gz from
http://people.canonical.com/~sforshee/wifi-debug, captured while DL one
20 MB file when it said "Collecting data, press Enter to stop...", if
that helps.

** Attachment added: "wifi-debug-files.tar.gz"
   https://bugs.launchpad.net/ubuntu/+source/linux-lts-utopic/+bug/1427431/+attachment/4332736/+files/wifi-debug-files.tar.gz

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https://bugs.launchpad.net/bugs/1427431

Title:
  WiFi issues on Lenovo ThinkPad X1 Carbo 2nd Gen with Intel AC 7260
  (rev 83 / 0x144), high “mac retries” and Tx excessive retries:1765
  Invalid misc:842.

Status in linux-lts-utopic package in Ubuntu:
  New

Bug description:
  Aloha Ubuntu, I’m seeing serious WiFi issues on a Lenovo ThinkPad X1
  Carbo 2nd Gen with Intel AC 7260 (rev 83 / 0x144), with latest BIOS
  upgrade. It seems to depend on WiFi router, its happens less
  frequently in office, and is worst and quite easily reproducible in a
  certain spot at home furthest (10m!) away from WiFi router, but
  clearly indendant of only one WiFi router (they are completely
  different in office vs. home). I’m, intentionally NOT connecting to a
  “5 Ghz Network” (does that mean 802.11n??), as my home WiFi router has
  two separate SSIDs.

  Normal web surfing in general and downloads in particular will go
  sour. wavemon will show high “mac retries” (as in >1000, within
  minutes) and iwconfig wlan0 will show growing “Tx excessive retries”
  (say 1765) and “Invalid misc” (842). NOTE this is a little different
  from the “missed beacons” seen in other reports (mine are 0! as shown
  by both wavemon & iwconfig). Ping 8.8.8.8 shows like 20% or more
  “packet loss”. I cannot see anything interesting (related) in e.g.
  /var/log/kern.log.

  I’ve seen a number of other bug reports related to the 7260, incl.
  1354975, 1369101, 1397032 1382005, 1400022, 1403142, 1403142, 1405437,
  1417552, 1289961, 1421838, 1354975, 1371425, 1426259 but on reading
  them gathered that you prefer individual reports per HW? Please
  duplicate this should you believe this to be identical to one of
  those.

  I’ve NOT changed any power saving stuff (I’d LIKE it to save power..).
  Also NOT touched anything to do with regulatory region stuff (huh?). I
  HAVE already done the “options iwlwifi 11n_disable=1” thing in
  /etc/modprobe.d/iwlwifi-disable11n.conf. Based on 1354975, I’ve today
  also done sudo apt-get install linux-generic-lts-utopic to go from my
  original 14.04 3.13 Kernel to the 3.16, and can see via dmesg | grep
  iwlwifi that it's now "loaded firmware version 25.228.9.0 op_mode
  iwlmvm" whereas previously it was "22.24.8.0".

  PS: I’m relatively new to Ubuntu Bug reporting (but very familiar with
  OSS in other contexts), and happy to try out suggestions, to learn and
  if you are willing to guide. Happy to try 3.17 Kernel as per
  KernelMainlineBuilds if useful (have never done..), or to.. recompile
  git cherry-pick fixes and rebuild iwlwifi, if this is what it takes to
  fix this - whatever it takes. If I can’t fix this, I think I’ll send
  the ThinkPad X1 back to Lenovo - its pretty, but with WiFi semi
  functional, useless to me. (I guess I could always use it as a very
  expensive nice thin photo frame? ;)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.16.0-31-generic 3.16.0-31.41~14.04.1
  ProcVersionSignature: Ubuntu 3.16.0-31.41~14.04.1-generic 3.16.7-ckt5
  Uname: Linux 3.16.0-31-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Mar  3 01:01:51 2015
  InstallationDate: Installed on 2014-06-07 (268 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  SourcePackage: linux-lts-utopic
  UpgradeStatus: No upgrade log present (probably fresh install)

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