screen flickering ubuntu 14.04

[nouha]

I have sony VAIO, serie E VPCEH16EF, nvidia Geforce with cuda,i3
I have upgraded my ubuntu from 13.10 =>14.04.1 LTS
I faced many problems,with unity and GPU
black screen then just login screen then i've tried to fix it... it works now good..
but still one thing: my screen flickering
thought it was from my nvidia card, here's the output of nvidia-settings -q NvidiaDriverVersion :

  Attribute 'NvidiaDriverVersion' (nouha-VPCEH16EF:0.0): 340.24
  Attribute 'NvidiaDriverVersion' (nouha-VPCEH16EF:0[gpu:0]): 340.24

and by the way

https://drive.google.com/file/d/0B55mJS-yKk03SThUd2l3RkVfQkE/edit?usp=sharing

I don't know what to do
help pllllzzz
:(

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1354088/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[penalvch (penalvch)]

nouha, 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 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 1354088

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.]