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I have an Edimax EW-7811UTC WiFi adapter connected to my Pi 2 to connect it to the Internet.I also have connected it to my computer via Ethernet to share this connection.The problem is that when I power on the Pi with this setup, at a certain point the WiFi adapter LED starts blinking as if it were connecting to the network but then stops, and I have to unplug and plug it again for it to start working properly.This also happens sometimes when I power off/reboot the computer.

  • I also noticed this as I also use a EDIMAX. It looks like that's a bug of the adapter. It doesn't happen with my Fritz Adapter. – Max Muster Jun 14 '16 at 21:35
  • How have you configured networking? Without this we are working in the dark. – Milliways Jun 15 '16 at 0:06
  • are you using a 2A power Adapter? because if not this will definitely cause a lot of problems for your wifi module – Shan-Desai Jun 15 '16 at 6:42
  • I'm using a 2.1A power adapter.My /etc/network/interfaces and wpa_supplicant.conf: pastebin.com/raw/MugHCmeT – user2859982 Jun 15 '16 at 10:43
  • I tried plugging my laptop when WiFi was connected and this was logged in syslog: pastebin.com/raw/0VgfW9ad – user2859982 Jun 15 '16 at 12:44
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Solved it, the file /etc/ifplugd/ifplugd.action that gets called by ifplugd when eth0 is plugged executes all files in /etc/ifplugd/action.d, including action_wpa, which "disconnects any wpa-roam managed interfaces so that only one "roaming" interface remains active on the system" if an ifplugd managed interface is brought up.

Since I wanted to be able to hotplug eth0, I just commented out these lines:

#if wpa_action "${IFACE}" check; then                                                                                               
#       wpa_cli -i "${IFACE}" "${COMMAND}"
#fi

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