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[AZ <1310055@xxxxxxxxxxxxxxxxxx>]

Please find attached two patches on top of 3.15-rc7 (vanilla kernel)
that makes my 57c:8501 (AVM Fritz Stick N v2 - B) device work.

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https://bugs.launchpad.net/bugs/1310055

Title:
  rt2x00 driver doesn't load for 57c:8501 (AVM Fritz Stick Nv2)

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  So i tried to use the wifi USB AVM Fritz Stick N v2  , USB ID 57c:8501  with Saucy and Trusty.
  Unfortunately it fails to initialise properly.

  According to the label on it , this device is powered by a Ralink
  RT5572N chipset.

  The rt2x00 driver seems to recognize this device:

  [    0.000000] Linux version 3.13.0-19-generic (buildd@akateko) (gcc version 4.8.2 (Ubuntu 4.8.2-17ubuntu1) ) #40-Ubuntu SMP Mon Mar 24 02:36:06 UTC 2014 (Ubuntu 3.13.0-19.40-generic 3.13.6)
  [   20.057058] ieee80211 phy0: rt2x00_set_rt: Info - RT chipset 5592, rev 0222 detected
  [   20.103139] ieee80211 phy0: rt2x00usb_vendor_request: Error - Vendor Request 0x09 failed for offset 0x0000 with error -32
  [   20.103144] ieee80211 phy0: rt2x00lib_probe_dev: Error - Failed to allocate device
  [   20.103158] rt2800usb: probe of 1-1.3:1.0 failed with error -32
  [   20.103199] usbcore: registered new interface driver rt2800usb

  As we can see it fails to properly initialize the device.

  I am running the most recent Kubuntu 14.04 64bit release that came out
  this week.

  What i exspect to happen is that the device works and i would be able to connect to my wifi network, what happens instead is that only the ethernet card is visible and usable.
  --- 
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  imho       2165 F.... pulseaudio
                        imho       2225 F.... pulseaudio
   /dev/snd/controlC0:  imho       2165 F.... pulseaudio
                        imho       2225 F.... pulseaudio
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 14.04
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-04-18 (1 days ago)
  InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.1)
  IwConfig:
   eth0      no wireless extensions.
   
   eth1      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  Package: linux (not installed)
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=22de8a22-b2b4-4eca-aadf-921bf4783437 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  RfKill:
   0: hci0: Bluetooth
   	Soft blocked: no
   	Hard blocked: no
  Tags:  trusty
  Uname: Linux 3.13.0-24-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 05/02/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1606
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8P67 EVO
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1606:bd05/02/2011:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP8P67EVO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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