I emailed edimax support -  I was advised to try the driver from

http://www.realtek.com/downloads/downloadsView.aspx?Langid=1&PNid=21&PFid=48&Level=5&Conn=4&ProdID=231&DownTypeID=3&GetDown=false&Downloads=true

This doesn't work in either Ubuntu 12.10 or 12.04. (Ubuntu 12.04 has the
exact same issues as 12.10 'out the box' also )

I have included the full build log as an attachment

here is  a snipet

----------------
In file included from 
/home/morgan/Downloads/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/driver/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/include/drv_types.h:73:0,
                 from 
/home/morgan/Downloads/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/driver/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/cmd/rtl871x_cmd.c:24:
/home/morgan/Downloads/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/driver/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/include/rtl871x_recv.h:
 In function ‘rxmem_to_recvframe’:
/home/morgan/Downloads/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/driver/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/include/rtl871x_recv.h:435:30:
 warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
/home/morgan/Downloads/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/driver/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/include/rtl871x_recv.h:435:9:
 warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
/home/morgan/Downloads/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/driver/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/cmd/rtl871x_cmd.c:
 In function ‘_init_cmd_priv’:
/home/morgan/Downloads/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/driver/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/cmd/rtl871x_cmd.c:93:75:
 warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
/home/morgan/Downloads/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/driver/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/cmd/rtl871x_cmd.c:101:60:
 warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
/home/morgan/Downloads/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/driver/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/cmd/rtl871x_cmd.c:
 In function ‘_init_evt_priv’:
/home/morgan/Downloads/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/driver/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/cmd/rtl871x_cmd.c:135:59:
 warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
make[2]: *** 
[/home/morgan/Downloads/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/driver/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/cmd/rtl871x_cmd.o]
 Error 1
make[1]: *** 
[_module_/home/morgan/Downloads/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405/driver/rtl8712_8188_8191_8192SU_usb_linux_v2.6.6.0.20120405]
 Error 2
make[1]: Leaving directory `/usr/src/linux-headers-3.5.0-18-generic'
make: *** [modules] Error 2
##################################################
Compile make driver error: 2
Please check error Mesg
##################################################
----------------

** Attachment added: "build log"
   
https://bugs.launchpad.net/ubuntu/+bug/1079671/+attachment/3439409/+files/error.log

** Tags added: precise

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https://bugs.launchpad.net/bugs/1079671

Title:
  Edimax wlan USB EW-7622UMn  - Ubuntu 12.10 - device not compatible,
  never able to authenticate (other cards on same system fine)

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