Wifi disconnects when screen is locked

[Mark Haase]

Ubuntu: 17.04
Wifi Chipset: Intel 7260 rev bb
Driver: iwlwifi 4.10.0-19-generic

If I lock my screen overnight, the following morning my Wifi will be disconnected and is slow to reconnect and often requires multiple connection attempts. Locking my screen for a short period of time (minutes or hours) doesn't trigger the behavior.

Dmesg:

```
[1256404.227085] wlp5s0: authenticate with 00:25:9c:xx:xx:xx
[1256404.229298] wlp5s0: send auth to 00:25:9c:xx:xx:xx (try 1/3)
[1256404.230281] wlp5s0: authenticated
[1256404.843347] wlp5s0: Connection to AP 00:25:9c:xx:xx:xx lost
[1256409.234035] wlp5s0: aborting authentication with 00:25:9c:xx:xx:xx by local choice (Reason: 3=DEAUTH_LEAVING)
[1256413.045691] wlp5s0: authenticate with 00:25:9c:xx:xx:xx
[1256413.047962] wlp5s0: send auth to 00:25:9c:xx:xx:xx (try 1/3)
[1256413.048999] wlp5s0: authenticated
[1256413.661996] wlp5s0: Connection to AP 00:25:9c:xx:xx:xx lost
[1256418.051499] wlp5s0: aborting authentication with 00:25:9c:xx:xx:xx by local choice (Reason: 3=DEAUTH_LEAVING)
[1256422.361848] wlp5s0: authenticate with 00:25:9c:xx:xx:xx
[1256422.364062] wlp5s0: send auth to 00:25:9c:xx:xx:xx (try 1/3)
[1256422.365122] wlp5s0: authenticated
[1256422.978086] wlp5s0: Connection to AP 00:25:9c:xx:xx:xx lost
[1256426.516541] wlp5s0: aborting authentication with 00:25:9c:xx:xx:xx by local choice (Reason: 3=DEAUTH_LEAVING)
[1256426.518958] IPv6: ADDRCONF(NETDEV_UP): wlp5s0: link is not ready
[1256426.524074] IPv6: ADDRCONF(NETDEV_UP): wlp5s0: link is not ready
[1256426.544019] IPv6: ADDRCONF(NETDEV_UP): wlp5s0: link is not ready
[1256426.578930] wlp5s0: authenticate with 00:25:9c:xx:xx:xx
[1256426.581309] wlp5s0: send auth to 00:25:9c:xx:xx:xx (try 1/3)
[1256426.582424] wlp5s0: authenticated
[1256426.582716] wlp5s0: associate with 00:25:9c:xx:xx:xx (try 1/3)
[1256426.583584] wlp5s0: RX AssocResp from 00:25:9c:xx:xx:xx (capab=0x11 status=0 aid=1)
[1256426.584763] wlp5s0: associated
[1256426.584867] IPv6: ADDRCONF(NETDEV_CHANGE): wlp5s0: link becomes ready
[1256426.630815] bridge-wlp5s0: device is wireless, enabling SMAC
[1256426.630817] bridge-wlp5s0: up
[1256426.630823] bridge-wlp5s0: attached
```

There are hundreds of lines like this. It looks like it gets into a loop where it disconnects every 5 seconds. Once I log in and reconnect using the applet in the menu bar, the connection is pretty reliable for hours -- I generally work a full day without wifi dropping.

[Sebastien Bacher (seb128)]

Thank you for your bug report. What desktop environment are you using? Is it still an issue in newer Ubuntu series?

[Launchpad Janitor (janitor)]

[Expired for network-manager (Ubuntu) because there has been no activity for 60 days.]