[Bug 1578083] [NEW] Desktop effects were restarted due to a graphics reset

[Fibonacci]

Public bug reported:

I've noticed since Wily that, after my KDE session has been open for
about a day, it freezes several times a day for a few seconds, then
becomes (somewhat) usable again right after the following message is
displayed in the bottom right corner of the screen:

Desktop effects were restarted due to a graphics reset

Usually, for some minutes before the freeze, CPU usage is at 100% on all
cores. This is usually lowered right after the session unfreezes, but
gets progressively worse with each freeze which lasts longer each time,
up until my PC is unusable without a reboot.

I'm using a Kubuntu 16.04 fresh install with all updates. The kwin
version is 4:5.5.5-0ubuntu1.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: kwin-x11 4:5.5.5-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: KDE
Date: Wed May  4 01:47:55 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-04-27 (6 days ago)
InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: kwin
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: kwin (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1578083

Title:
  Desktop effects were restarted due to a graphics reset

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