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[mmaurer <1464723@xxxxxxxxxxxxxxxxxx>]

Just checked.

The upstream Kernel versions: 4.1.0-040100rc7-generic #201506080035 and 3.19.8-031908-generic #201505110938 from http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D don't seem to exhibit this problem.
Will try to do a git bisect between "355957e Linux 3.19.8" and "a52caa6 UBUNTU: Ubuntu-3.19.0-20.20" and see what that turns up.

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https://bugs.launchpad.net/bugs/1464723

Title:
  Human interface devices stop working on USB 2.0 ports after some time,
  continue to work on USB 3.0

Status in xorg package in Ubuntu:
  New

Bug description:
  On my Asus X93SV-YZ225V laptop my mouse as well as all other 'human interface devices' (I tried it with a second mouse and a keyboard) stop working at a random time after boot, when attached to a USB 2.0 port.
  Other USB-devices (I tried it with several USB Flash drives) continue to work on the USB 2.0 ports.

  The USB 3.0 port on the laptop does not show this behavior, i.e. a
  human interface device never stops working.

  Unplugging and replugging the mouse does not reactivate it.

  The mouse works again for a random amount of time after a reboot or a
  wake-up from suspend to RAM.

  When the mouse stops working the respective /dev/input/mouseX device
  does not produce any output either.

  The touchpad, that is connected via PS/2, does not show this bug.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-20.20-generic 3.19.8
  Uname: Linux 3.19.0-20-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Fri Jun 12 14:50:29 2015
  DistUpgraded: Fresh install
  DistroCodename: vivid
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:105c]
   NVIDIA Corporation GF108M [GeForce GT 540M] [10de:0df4] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:105c]
  InstallationDate: Installed on 2015-05-16 (26 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: ASUSTeK Computer Inc. K93SV
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-20-generic root=UUID=4f453054-6eeb-4f48-ba87-b529b2fcd617 ro nosplash
  SourcePackage: xorg
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/22/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: K93SV 209
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: K93SV
  dmi.board.vendor: ASUSTeK Computer Inc.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer Inc.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrK93SV209:bd11/22/2011:svnASUSTeKComputerInc.:pnK93SV:pvr1.0:rvnASUSTeKComputerInc.:rnK93SV:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: K93SV
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.
  version.compiz: compiz 1:0.9.12.1+15.04.20150410.1-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.60-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.2-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.2-0ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2.2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1
  xserver.bootTime: Fri Jun 12 13:08:49 2015
  xserver.configfile: default
  xserver.errors:
   Failed to load module "nvidia" (module does not exist, 0)
   Failed to load module "nvidia" (module does not exist, 0)
   NOUVEAU(G0): [XvMC] Failed to initialize extension.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                6152 
   vendor                                     CMO
  xserver.version: 2:1.17.1-0ubuntu3

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