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

[auspex]

We used to have this. I'm sure, a decade ago, I could actually tell
whatever was managing the hibernate/suspend, in the gui, to remove certain
kernel modules on suspend and load them on resume. Now we're right back to
needing it.

derek

On Thu, Nov 17, 2016 at 1:59 PM, Hans Deragon <hans at deragon.biz> wrote:

> This serious issue is dragging to long.  People want computers that
> "just work".  If pinpointing the source of the problem is difficult and
> few resources are available, why not package a workaround that restarts
> NetworkManager upon resume?
>
> Attached is my workaround.  Works nicely.  Finally, I have a computer
> that "just works" and it's not a Mac (well, I have other issues but this
> one is solved).
>
> Simple move the script under /lib/systemd/system-sleep and ensure it is
> executable.
>
> ** Attachment added: "Workaround that restarts the NetworkManager upon
> resume."
>    https://bugs.launchpad.net/ubuntu/+source/network-
> manager/+bug/1585863/+attachment/4778652/+files/
> NetworkManagerRestartWorkaroundForBug1380480.sh
>
> --
> You received this bug notification because you are subscribed to a
> duplicate bug report (1448555).
> https://bugs.launchpad.net/bugs/1585863
>
> Title:
>   WiFi malfunction after suspend & resume stress - sudo wpa_cli scan
>   required to fix it.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/network-manager/+bug/1585863/+subscriptions
>

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https://bugs.launchpad.net/bugs/1585863

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

Status in NetworkManager:
  New
Status in OEM Priority Project:
  New
Status in OEM Priority Project xenial series:
  New
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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