screen freezes periodically

[Lorange]

After the recent installing of Kubuntu, the screen freezes periodically. It appears often but accidentally. The keyboard and mouse work, the application continues to run, but the screen is not updated. ALT + CTRL + F1 is working and "sodo service lightdm restart" solves problem for while.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: kubuntu-desktop 1.308.1.1
ProcVersionSignature: Ubuntu 3.13.0-34.60-generic 3.13.11.4
Uname: Linux 3.13.0-34-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.3
Architecture: i386
CurrentDesktop: KDE
Date: Thu Aug 28 10:38:41 2014
InstallationDate: Installed on 2014-08-27 (0 days ago)
InstallationMedia: Kubuntu 14.04.1 LTS "Trusty Tahr" - Release i386 (20140722.2)
SourcePackage: kubuntu-meta
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[penalvch (penalvch)]

Lorange, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ .

If it remains an issue, could you please run the following command in the development release from a Terminal as it will automatically gather and attach updated debug information to this report:

apport-collect -p xorg 1362419

Please ensure you have xdiagnose installed, and that you click the Yes button for attaching additional debugging information.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

[Launchpad Janitor (janitor)]

[Expired for xorg (Ubuntu) because there has been no activity for 60 days.]