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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu Xenial)
       Status: Incomplete => Invalid

** Changed in: linux (Ubuntu)
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1581651

Title:
  Xenial desktop unusable under simple I/O through USB

Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Xenial:
  Invalid

Bug description:
  
  Hello!

  After installing Xenial [0] I experience the following: when I do I/O through USB (to/from simple pendrives, or an
  external HDD I have), the desktop becomes unusable, because it goes very very unresponsive.

  With unresponsive I mean:

  - all windows go greyed out (like when it's failing to answer in time,
  as if the process inside that window locked up)

  - firefox and thunderbird start to pop up the typical "the script is taking too much to finis, want to kill
  it/continue/etc" (in whatever tab I'll be, so it's not the JS scripts (for once!)

  - the mouse pointer goes jumpy, not really following my hand movement

  - I see in thee indicator-multiload widget that CPU time is "wasted"
  in "waiting i/o"; which I confirmed looking at "top".

  So, in short: even while understanding that CPU would wait a little for i/o and that the system will be under a little
  load by writing a pen-drive, I find current situation beyond a normal experience.

  How can I start to debug this? What I can try? Can I provide you more
  info?

  Thanks!

  Regards,

  [0] from scratch, in the computer where I always work; I previously
  had Trusty here

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-21-generic 4.4.0-21.37
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  facundo    2338 F.... pulseaudio
   /dev/snd/controlC3:  facundo    2338 F.... pulseaudio
   /dev/snd/controlC2:  facundo    2338 F.... pulseaudio
   /dev/snd/controlC0:  facundo    2338 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri May 13 16:13:12 2016
  HibernationDevice: RESUME=UUID=5dabff2e-722b-4c99-8bf5-003643ad0d04
  InstallationDate: Installed on 2016-04-01 (42 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160323)
  MachineType: Gigabyte Technology Co., Ltd. GA-970A-D3
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic root=UUID=6ba5d9f5-e21f-4e58-800d-89ec0b7d1e9b ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-21-generic N/A
   linux-backports-modules-4.4.0-21-generic  N/A
   linux-firmware                            1.157
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/13/2011
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F7
  dmi.board.name: GA-970A-D3
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF7:bd10/13/2011:svnGigabyteTechnologyCo.,Ltd.:pnGA-970A-D3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-970A-D3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: GA-970A-D3
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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