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[Sworddragon <1325819@xxxxxxxxxxxxxxxxxx>]

I have now tested some different versions to find the first problematic
version. On the last test I have booted multiple times with kernel
3.13.11.2-trusty and all was working fine. But on booting multiple times
with kernel 3.14-rc1-trusty I have always noticed this I/O issue.

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https://bugs.launchpad.net/bugs/1325819

Title:
  I/O performance problems with kernel 3.15.x

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I'm using Ubuntu 14.10 dev with linux-image-generic 3.15.0.5.6 and after the kernel 3.15.x was installed I noticed some I/O problems after a reboot. I'm noticing that now on every boot my hard disk will stop multiple times for a short time and logging out from the console does sometimes hang a few seconds.
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.15.0-5-generic.
  ApportVersion: 2.14.3-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0p:   root       2613 F...m plugin-containe
   /dev/snd/controlC0:  root       2613 F.... plugin-containe
   /dev/snd/timer:      root       2613 f.... plugin-containe
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'SB'/'HDA ATI SB at 0xfcff4000 irq 16'
     Mixer name	: 'Realtek ALC662 rev1'
     Components	: 'HDA:10ec0662,18497662,00100101'
     Controls      : 36
     Simple ctrls  : 18
  Card1.Amixer.info:
   Card hw:1 'NVidia'/'HDA NVidia at 0xfe97c000 irq 19'
     Mixer name	: 'Nvidia GPU 42 HDMI/DP'
     Components	: 'HDA:10de0042,14583555,00100100'
     Controls      : 21
     Simple ctrls  : 3
  CurrentDmesg:
   Error: command ['sh', '-c', 'dmesg | comm -13 --nocheck-order /var/log/dmesg -'] failed with exit code 1: comm: /var/log/dmesg: No such file or directory
   dmesg: write failed: Broken pipe
  DistroRelease: Ubuntu 14.10
  EcryptfsInUse: Yes
  IwConfig: Error: [Errno 2] No such file or directory
  Lsusb: Error: [Errno 2] No such file or directory
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.15.0-5-generic root=UUID=05338ff8-a226-421b-90a4-1dd45199f783 ro elevator=cfq
  ProcVersionSignature: Ubuntu 3.15.0-5.10-generic 3.15.0-rc8
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  utopic
  Uname: Linux 3.15.0-5-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  WifiSyslog:
   
  _MarkForUpload: True
  dmi.bios.date: 10/02/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P1.40
  dmi.board.asset.tag: BC5FF4739C55
  dmi.board.name: 960GM/U3S3 FX
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.40:bd10/02/2013:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rn960GM/U3S3FX:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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