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I am using an external USB wireless adapter (EnGenius Wirelss 11N) on Elementary OS Freya running on a Dell Vostro 1510.

Whereas the USB wireless is detected and connects when plugged in, it is not connecting after suspending the OS. In order to re-connect the wireless adapter, I must remove the USB connection and plug it back in again, at what point the adapter is detected and the connection established.

lsusb however returns the same list whether after suspending as after re-plugging the wireless adapter, namely:

Bus 002 Device 004: ID 1058:07a8 Western Digital Technologies, Inc. 
Bus 002 Device 007: ID 1740:9603 Senao RTL8188S WLAN Adapter
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 002: ID 2188:0ae1  
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 0c45:63e0 Microdia Sonix Integrated Webcam
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

When removing the adapter, Bus 002 Device 007: ID 1740:9603 Senao RTL8188S WLAN Adapter misses from the lsusb output.

Funny thing: if I reboot the laptop, the device is detected and connection established flawlessly.

The expected behavior is the wireless adapter to be connected and detected, even after suspension of the OS.

Note: This problem used to happen as well on the same device, using different wireless adapters as well as 3G adapters on Ubuntu 12.4 and 13.4.

How can it be fixed?

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