Weird partial screen flickering after upgrade to 14.04
This worked for me: http://ubuntuforums.org/showthread.php?t=2243912
Enable Force full screen redraws on repaint option in Workarounds
I had random flickering similar to this (eg. part of webpage flickered in Firefox (hardware acceleration = on), or desktop icon flickered when deselecting it) and this seemed to fixed this issue.
I'm using Nvidia drivers 340.58, Lenovo Y500 GT 750m (single, no optimus, IntelHD disabled).
It's a bug in Compiz. If it affects you then you should go here and click on "this bug affects me".
There is a workaround but it can make the system a little bit slower.
Install CompizConfig Settings Manager, then go to Composite
and disable Unredirect fullscreen windows
.
I have installed nvidia-331 (331.38-0ubuntu7)
drivers and for few days now I have not experienced any flickering so probably it was a problem with the drivers (xorg-egders
version 334
or recent 337
)