[Bug 1585863] Re: WiFi malfunction after suspend & resume stress - sudo wpa_cli scan required to fix it.

[Dan Dascalescu]

"after resume, only a couple of wifi networks will be listed at most,
and never the one I use" - that's exactly the symptom I see after
resuming my DELL E7450. Also, the Wi-Fi icon is replaced with an "arrow
up arrow down" one. `sudo service network-manager restart` reconnects
most of the time, but sometimes that wrong icons stays on.

I've just modified `/lib/systemd/system-sleep/wpasupplicant` as
described in #64, and will be testing for the next several days. Is a
reboot necessary for that modification to take effect?

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Title:
  WiFi malfunction after suspend & resume stress - sudo wpa_cli scan
  required to fix it.

Status in OEM Priority Project:
  New
Status in OEM Priority Project xenial series:
  Confirmed
Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  Description:    Ubuntu Yakkety Yak (development branch)
  Release:        16.10
  Packages:
  libnm-glib-vpn1:amd64   1.2.2-0ubuntu2
  libnm-glib4:amd64       1.2.2-0ubuntu2
  libnm-util2:amd64       1.2.2-0ubuntu2
  libnm0:amd64    1.2.2-0ubuntu2
  network-manager 1.2.2-0ubuntu2

  Reproduce steps:
  1. Install fwts by `sudo apt-get install fwts`.
  2. Run the suspend & resume stress test.
  sudo fwts s3 --s3-multiple=30 --s3-min-delay=5 --s3-max-delay=5 --s3-delay-delta=5

  Expected result:
  The WiFi still functioned.

  Actual result:
  The WiFi can not connect to any access point and we have to execute `sudo wpa_cli scan` manually to make it work again.

  P.S. Ubuntu 16.04 also has the same issue.

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