Random lack of wifi connectivity after hibernate

[Iiro Laiho]

On Latitude E6320, there are some weird wifi connectivity issues that appear some times on resume. The problem goes away after a reboot or unloading and loading the kernel driver module. I haven't found any common factor that would unify those incidents. I am currently running the brcmsmac open source driver, but have encountered the issue with the Broadcom STA driver as well.

The issue may or may not be linked to the "eduroam" WPA Enterprise network that is used in many academic institutions.

The lspci command outputs a following line about the adapter:

02:00.0 Network controller: Broadcom Corporation BCM4313 802.11bgn Wireless Network Adapter (rev 01)

I am running the lastest BIOS version, the A19.

(Possible) user workaround: Put line:
SUSPEND_MODULES="brcmsmac"
to the file "/etc/pm/config.d/unload_module". Replace "brcmsmac" with the proprietary driver's module name (bcmwl?) if you are using it.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: pm-utils 1.4.1-16
ProcVersionSignature: Ubuntu 4.4.0-43.63-generic 4.4.21
Uname: Linux 4.4.0-43-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Sat Oct 22 16:47:43 2016
InstallationDate: Installed on 2016-09-12 (39 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=fi
 TERM=xterm
 PATH=(custom, no user)
 LANG=fi_FI.UTF-8
 SHELL=/bin/bash
SourcePackage: pm-utils
UpgradeStatus: No upgrade log present (probably fresh install)