wifi turned off after resume, "turn on" works

[Lasse Kliemann]

Ubuntu Gnome 16.04 Beta 2

In about 50% of the cases, wifi is turned off after resuming from suspend. Switching it on ("Turn On") makes it work again.

Similar problems have been in Ubuntu-based distributions for years. This one is different in that turning wifi on manually always solves it - it will then connect immediately.

Hardware: Dell Latitude E7250

02:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59)
 Subsystem: Intel Corporation Dual Band Wireless-AC 7265
 Flags: bus master, fast devsel, latency 0, IRQ 51
 Memory at f7000000 (64-bit, non-prefetchable) [size=8K]
 Capabilities: [c8] Power Management version 3
 Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
 Capabilities: [40] Express Endpoint, MSI 00
 Capabilities: [100] Advanced Error Reporting
 Capabilities: [140] Device Serial Number 18-5e-0f-ff-ff-00-c5-17
 Capabilities: [14c] Latency Tolerance Reporting
 Capabilities: [154] L1 PM Substates
 Kernel driver in use: iwlwifi
 Kernel modules: iwlwifi

When it is working:

$ rfkill list
1: dell-wifi: Wireless LAN
 Soft blocked: no
 Hard blocked: no
2: dell-bluetooth: Bluetooth
 Soft blocked: yes
 Hard blocked: no
3: phy0: Wireless LAN
 Soft blocked: no
 Hard blocked: no
8: hci0: Bluetooth
 Soft blocked: yes
 Hard blocked: no

After resume, when not working:

$ rfkill list
1: dell-wifi: Wireless LAN
 Soft blocked: yes
 Hard blocked: no
2: dell-bluetooth: Bluetooth
 Soft blocked: yes
 Hard blocked: no
3: phy0: Wireless LAN
 Soft blocked: yes
 Hard blocked: yes
10: hci0: Bluetooth
 Soft blocked: yes
 Hard blocked: no

[Lasse Kliemann (lxkl)]

rfkill unblock wifi

will also re-enable it.

A workaround would be to put this command in a script that is automatically executed after resume. However, that would interfere with flight mode. So if someone was on a plane, went into flight mode and then suspended and resumed, they would potentially be in trouble.

[Lasse Kliemann (lxkl)]

The same behavior on the same hardware after a fresh install of Ubuntu 16.02 Beta 2.

[Lasse Kliemann (lxkl)]

Here is some debug output from the network manager.

The log covers everything from the point in time when i closed the laptop (suspend) to when i opened it (resume) and realized that wifi has been de-activated.

Resume starts at time 10:56:23.

[Thomas Haller (thaller-1)]

As said, the Wi-Fi device is rfkill'ed in software after resume.

For example, there is a line:

  [1461574583.6441] WiFi rfkill state now 'soft-blocked'

You should be able to re-enable Wi-Fi by doing `nmcli radio wifi on`

Of course, that would be only a workaround. It's unclear to me who turns off
the radio here. I don't think it's done by NetworkManager... I don't know.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.