Public bug reported:
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)
** Affects: linux-lts-utopic (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug trusty
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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.
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