*** This bug is a duplicate of bug 1808389 ***
https://bugs.launchpad.net/bugs/1808389
Ok, this is a complex matter. I just experienced this unpleasant feature
on my laptop using the above described driver and hardware for the last
two days. =>It seems to be a radio transmission issue.<= (and this is
damned complex!)
The Linux driver as well as the microcode of the WiFi device must be
able to cope with the small frequency jumps of the access point. Yes,
frequencies are =>NOT<= very stable. This is shown in the logs by the
following messages: wpa_supplicant[971]: wlp1s0: CTRL-EVENT-SIGNAL-
CHANGE. When this event occurs, your hardware must resync with the
access point. The driver as well as the microcode of your WiFi device
may or may not support such a frequency jump. In other term they may or
may not be able to cope with the noise. The following log message shows
that my system was not able to cope with it: iwlwifi 0000:01:00.0:
Microcode SW error detected.
What actually solved the issue is re-configuring the access point. I
limited the channel width on the 2.4 Ghz frequency to 20 Mhz to avoid
interference with other access points in the area. In addition I defined
a precise channel for the access. For the channel selection, prefer
channel 1, 6 or 11, since they do not overlap. Now my connection is
stable and my logs are clean.
For the 5 Ghz network, these problem might not occur as frequently as on
the 2.4 Ghz one, since it is less used. In case similar issues are
faced, proceed similarly.
Hope it helps, Illi
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https://bugs.launchpad.net/bugs/1804841
Title:
iwlwifi Microcode SW error detected. Restarting 0x2000000.
Status in linux package in Ubuntu:
Incomplete
Status in linux-firmware package in Ubuntu:
Incomplete
Bug description:
This seems to be a return of an existing bug, in newer hardware and
microcode versions.
Wireless card: Intel Corporation Wireless 8265 / 8275 [8086:24fd] (rev 78)
Firmware version: 34.0.1
Description: Ubuntu 18.04.1 LTS
Frequent errors as soon as I connect to wifi:
Microcode SW error detected. Restarting 0x2000000.
Expected to happen: Great and stable wifi like a couple of weeks ago
What happens: very slow, intermittent internet access, lots of ping loss
Found a suggestion of a workaround: adding these lines to
/etc/NetworkManager/NetworkManager.conf
[device]
wifi.scan-rand-mac-address=no
These lines were already there, not added by me.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-firmware 1.173.2 [modified: lib/firmware/iwlwifi-8265-36.ucode]
ProcVersionSignature: Ubuntu 4.15.0-39.42-generic 4.15.18
Uname: Linux 4.15.0-39-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
Date: Fri Nov 23 15:23:54 2018
Dependencies:
InstallationDate: Installed on 2018-09-03 (81 days ago)
InstallationMedia: Kubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64
(20180725)
PackageArchitecture: all
SourcePackage: linux-firmware
UpgradeStatus: No upgrade log present (probably fresh install)
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