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D-Link DWA-125/B1 is a relatively new USB Wi-Fi adapter, using a Ralink chipset 
supported by the rt2800usb driver. Currently, to work around the problem (it's 
missing in all present kernel versions, up to and including 3.7.x), I had to 
add this to /etc/rc.local:

echo 2001 3c1e >> /sys/bus/usb/drivers/rt2800usb/new_id

After that, the device works without problems. Been using it for over a week 
with no bugs in sight.

The attached patch is trivial and simply adds the new USB ID to the list of 
devices handled by rt2800usb.


Signed-off-by: Maia Kozheva <si...@ubuntu.com>
diff -uprN a/drivers/net/wireless/rt2x00/rt2800usb.c 
b/drivers/net/wireless/rt2x00/rt2800usb.c
- --- a/drivers/net/wireless/rt2x00/rt2800usb.c 2012-12-09 15:30:39.051951506 
+0700
+++ b/drivers/net/wireless/rt2x00/rt2800usb.c   2012-12-09 15:31:07.679951314 
+0700
@@ -965,6 +965,7 @@ static struct usb_device_id rt2800usb_de
        { USB_DEVICE(0x07d1, 0x3c15) },
        { USB_DEVICE(0x07d1, 0x3c16) },
        { USB_DEVICE(0x2001, 0x3c1b) },
+       { USB_DEVICE(0x2001, 0x3c1e) },
        /* Draytek */
        { USB_DEVICE(0x07fa, 0x7712) },
        /* DVICO */

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