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[Hervé BRY <setaou@xxxxxxxxxx>]

I have had this problem on the same hardware (Dell Inspiron 3847).
Upgrading the kernel to 3.16.2 (using the "mainline" packages) seems to have solved it.

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https://bugs.launchpad.net/bugs/1351282

Title:
  Sometimes USB does not work.

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Sometimes after booting, USB does not work
  I can't use the keyboard or mouse to find out. Only solution is to kill the system by long-pressing the powerbutton.
  The second time I boot, the USB system works.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-32-lowlatency 3.13.0-32.57
  ProcVersionSignature: Ubuntu 3.13.0-32.57-lowlatency 3.13.11.4
  Uname: Linux 3.13.0-32-lowlatency x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC3:  rob        1897 F.... pulseaudio
   /dev/snd/controlC2:  rob        1897 F.... pulseaudio
   /dev/snd/controlC1:  rob        1897 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Fri Aug  1 11:37:29 2014
  HibernationDevice: RESUME=UUID=8260a407-c264-46d4-9dfd-e33424768f0a
  InstallationDate: Installed on 2014-07-04 (27 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  MachineType: Dell Inc. Inspiron 3847
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-lowlatency root=UUID=90a1d355-c5af-46e6-be55-6a153fd2a8fa ro quiet splash nomodeset video=uvesafb:mode_option=1440x900-24,mtrr=3,scroll=ywrap
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-lowlatency N/A
   linux-backports-modules-3.13.0-32-lowlatency  N/A
   linux-firmware                                1.127.5
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/03/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A04
  dmi.board.name: 088DT1
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 3
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA04:bd04/03/2014:svnDellInc.:pnInspiron3847:pvr:rvnDellInc.:rn088DT1:rvrA01:cvnDellInc.:ct3:cvr:
  dmi.product.name: Inspiron 3847
  dmi.sys.vendor: Dell Inc.

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