[Bug 205477] urtwn Driver Fails To Initialize RTL8188CUS

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205477

            Bug ID: 205477
           Summary: urtwn Driver Fails To Initialize RTL8188CUS
           Product: Base System
           Version: 10.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: mrmschf at hotmail.com

Device: http://www.trendnet.com/products/proddetail.asp?prod=200_TEW-648UBM
Chipset: https://wikidevi.com/wiki/TRENDnet_TEW-648UBM

dmesg:
urtwn0: <vendor 0x0bda product 0x8191, class 0/0, rev 2.00/2.00, addr 4> on
usbus0
urtwn0: MAC/BB RTL8188CUS, RF 6052 1T1R
wlan0: Ethernet address: ff:ff:ff:ff:ff:ff

# usbconfig -d 0.4 dump_info
ugen0.4: <product 0x8191 vendor 0x0bda> at usbus0, cfg=0 md=HOST, spd=HIGH
(480Mbps) pwr=ON (500mA)

Tested on:
Official 10.2 amd64 image
Official 10.2 RPi image
releng/10.2 with custom kernel for RPi
-CURRENT as of 12/19/15 with custom kernel for RPi

Repro steps (simplest):
Get 10.2 going however you want
Add "legal.realtek.license_ack=1" and 'if_urtwn_load="YES"' to
/boot/loader.conf
Reboot with RTL8188CUS-based WiFi device inserted
Watch as FreeBSD fails to initialize your dongle

I know it's not a HW issue b/c I can plug it into my Ubuntu box w/ no problem.
It worked before, but the last time I remember testing was off -CURRENT last
December or this January.

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