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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Can you try booting the lowlatency kernel with the "nothreadirqs" boot
parameter?

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https://bugs.launchpad.net/bugs/1279081

Title:
  linux freezes with threadirqs parameter when rt73usb is loaded

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  While my usb wifi device is connected, the kernel will freeze while booting.
  I can boot into recovery mode, but freeze happens as soon as I enable networking.
  I can boot and login fine without the device attached. As soon as I plug it in, the system freezes.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-lowlatency 3.13.0.8.12
  ProcVersionSignature: Ubuntu 3.13.0-8.27-generic 3.13.2
  Uname: Linux 3.13.0-8-generic i686
  ApportVersion: 2.13.2-0ubuntu2
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  zequence   2598 F.... pulseaudio
   /dev/snd/controlC2:  zequence   2598 F.... pulseaudio
   /dev/snd/controlC0:  zequence   2598 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  CurrentDesktop: GNOME
  Date: Tue Feb 11 22:02:39 2014
  HibernationDevice: RESUME=UUID=ede81b37-17df-4f30-a234-1f1fb7f003ad
  MachineType: Gigabyte Technology Co., Ltd. 965P-DS4
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-8-generic root=UUID=7e51aea4-9325-401e-b318-bbf42e368c45 ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-8-generic N/A
   linux-backports-modules-3.13.0-8-generic  N/A
   linux-firmware                            1.124
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2013-10-11 (123 days ago)
  dmi.bios.date: 06/25/2009
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F12
  dmi.board.name: 965P-DS4
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF12:bd06/25/2009:svnGigabyteTechnologyCo.,Ltd.:pn965P-DS4:pvr:rvnGigabyteTechnologyCo.,Ltd.:rn965P-DS4:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: 965P-DS4
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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