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[Matthieu Baerts <matttbe@xxxxxxxxx>]

According to Wolfgang, this issue was only affected 64 bits users.
But your problem is certainly not exactly the same as this one.

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https://bugs.launchpad.net/bugs/659143

Title:
  64bit-only: regression: kernels >=2.6.34: rt2800pci: load firmware
  Error with ralink [1814:0781]

Status in The Linux Kernel:
  Fix Released
Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Maverick:
  Fix Released

Bug description:
  [UPDATE Dec 16, 2010]
  My fix is in linux-next. See comment 16.

  UPSTREAM:
  http://rt2x00.serialmonkey.com/pipermail/users_rt2x00.serialmonkey.com/2010-November/002310.html

  HARDWARE:
  RaLink RT2860 [1814:0781]
  rt2x00_set_chip: Info - Chipset detected - rt: 2872, rf: 0003, rev: 0200.

  SYMPTOM:
  Syslog says: "phy0 ->  rt2800pci_load_firmware: Error - PBF system register not ready.".

  WLAN does not work at all. The Network Manager Applet says: "Wireless networks disconnected".
  That log entry comes from module rt2800lib which is pulled in by module rt2800pci. (http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=drivers/net/wireless/rt2x00/rt2800lib.c;hb=HEAD)

  WHERE:
  In summary this happens on all tested ubuntu and debian 64 bit kernels 2.6.34 or newer, but not on 2.6.33 or older. It does however work on fedora's 2.6.35 64 bit live.

  POSSIBLE DUPLICATES:
  bug #594866 (ref. comment 10)

  WHERE IN DETAIL:
  where it happens:
  In final maverick 64 bit live.

  This also happens on the 2.6.36rc8 mainline kernel in a current installed maverick.
  Also happens there with compat-wireless-2010-10-20.

  Also happens on lucid with a backported natty kernel: (details in comment #5)
  on lucid (installed) 64bit:
  Linux w 2.6.36-1-generic #7~lucid1-Ubuntu
  Both with this kernels stock rt2800pci and with self compiled compat-wireless-2010-10-25-pc.

  Also happens with that 2.6.36-1.7~lucid1 kernel (natty for lucid from
  kernel team ppa) on maverick. The rt2800pci (stock from that kernel)
  produced the load firmware error. (comment #3)

  Happens with debian live (aptosid) kernel 2.6.35 64 bit, but not with
  32bit. (ref. comment 6)

  Happens with 2.6.34 (ref. comment 7)

  This bug does not happen with:
  not with 2.6.33 (ref. comment 7)

  This does not happen on 32 bit maverick live where WLAN works (out of
  the box) just as well as with the rt2860sta.

  Does _not_ happen with compat-wireless-2010-10-25-pc on lucid 64bit
  with the standard 2.6.32 kernel. It can connect. (Ping is 1000-25000ms
  though.)

  Does _not_ happen with compat-wireless-2010-10-25-pc on maverick
  (2.6.35 kernel) 32 bit live (ping went from good to 1000ms there
  within a minute after connecting however, but that is beside the point
  here.)

  This does not happen on Fedora 14 beta live 64bit. (I achieved a
  respectable 10Mb/s with iperf in ad hoc mode with the rt2800pci.
  rt2860sta is not included.)

  Not with 32 bit lucid:
  Linux ubu 2.6.32-24-generic (ref. comment 8)

  Not with 2.6.37rc1 32 bit (ref. comment 9)

  REPRODUCIBILITY: 100%
  best keep the competing rt2860sta from loading with the entry "install rt2860sta /bin/false" in a file in /etc/modprobe.d/;
  maverick also comes with the rt2860sta module which will often load and get used if it is just blacklisted ("blacklist rt2860sta");

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: linux-image-2.6.35-22-generic 2.6.35-22.33
  Regression: No
  Reproducible: Yes
  ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
  Uname: Linux 2.6.35-22-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
  Architecture: amd64
  AudioDevicesInUse:
   Cannot stat file /proc/3101/fd/40: Stale NFS file handle
                        USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     3097 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf4800000 irq 46'
     Mixer name	: 'Intel Cantiga HDMI'
     Components	: 'HDA:10ec0268,1025013c,00100101 HDA:14f12c06,10250093,00100000 HDA:80862802,80860101,00100000'
     Controls      : 21
     Simple ctrls  : 12
  Date: Tue Oct 12 12:23:21 2010
  LiveMediaBuild: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  MachineType: Acer Extensa 5630
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcCmdLine: BOOT_IMAGE=(loop)/casper/vmlinuz boot=casper iso-scan/filename=/boot/isostick/hostname/hostname-10.10-desktop-amd64.iso noprompt --
  ProcEnviron:
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  RelatedPackageVersions: linux-firmware 1.38
  SourcePackage: linux
  StagingDrivers: rt2860sta
  Title: [STAGING]
  dmi.bios.date: 12/05/2008
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: V1.25
  dmi.board.name: Homa
  dmi.board.vendor: Acer
  dmi.board.version: Rev
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrV1.25:bd12/05/2008:svnAcer:pnExtensa5630:pvr0100:rvnAcer:rnHoma:rvrRev:cvnAcer:ct10:cvrN/A:
  dmi.product.name: Extensa 5630
  dmi.product.version: 0100
  dmi.sys.vendor: Acer

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