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

[auspex]

You can try having the script do "modprobe -r" and "modprobe" on your wifi
module. That should always work, but seemed like overkill in my case. In
any case, these are workarounds, not fixes.

On 4 Aug 2016 6:01 a.m., "Aleve Sicofante" <asicofante at gmail.com> wrote:

> @auspex: Your script doesn't work here. I just created it and gave it
> execution permissions, rebooted and tried a sleep/resume cycle. No dice.
>
> I'm just amazed no one from Canonical is chiming in. This has been
> happening from the very moment I installed 16.04 on its release day and
> it happens in the two laptops I use (Lenovo T400 and Dell Studio 1537,
> both with Intel wireless cards). It's so obvious I didn't even try to
> file a bug understanding it would be naturally solved by 16.04.1 at the
> latest... I'm truly amazed in the worst sense.
>
> --
> 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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