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[Sergio Callegari <sergio.callegari@xxxxxxxxx>]

3.16.7-031607-generic seems to have no issue.
3.19.0-18-generic has the issue
4.0.4-040004-generic cannot be tested because it is impossible for me to use X with it (the nvidia proprietary driver 304 does not work with it and Kwin does not work on my hardware without it).

This is already good news since staying with the utopic kernel seems to
be a workable workaround.

In the future I'll try 3.17 and 3.18 if possible.

Will take some time since the machine is only rarely used after the
vivid upgrade as plasma 5 is too immature for regular use.

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https://bugs.launchpad.net/bugs/1451277

Title:
  Extremely high IOWait and processes hungs after utopic->vivid upgrade

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  On Kubuntu, 64 bit AMD Phenom2 machine with 4 cores, and old (Geoforge 7025) Nvidia graphics.
  Using LVM. Machine also has a 2 disk software raid (mirroring).

  The machine was working fine before the upgrade, now it is almost
  impossible to use it... I see Wait in Top always above 60%; in dmesg
  after a few minutes that the machine is up even if the machine does
  nothing. I see hung processes (typically vgs, but occasionally also
  others).  LVM related commands (e.g. lvdisplay) almost always hung at
  the terminal. I also see in ps some kernel workers almost constantly
  stuck in D state. Also, the machine takes ages to shutdown.

  Issue remains there also if I disable X (switch off the X login
  manager, sddm) and check at the console.

  Sorry I cannot provide details with apport, but the machine has been
  switched off and I will not be able to take it up again before a few
  days from now.

  The symptom I am observing may also be a sign of failing hardware, so
  please leave the bug as unconfirmed until I make some more tests or
  someone provide details on similar issues. In the meantime I would
  like to see if others are experiencing a similar serious issue. Is
  there anything specific that has changed between utopic and vivid, I
  should look into?

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