I see this bug as well on an Lenovo T420.

This bug does exist in wheezy. I can work around by simply downgrading to 

linux-image-3.2.0-4-amd64=3.2.35-2

Which I get from:
deb http://snapshot.debian.org/archive/debian/20130101/ wheezy main

I get this problem using KDE with or without the composition. Pretty much any 
activity (i.e., scrolling in konsole) triggers it. The system is totally 
unusable.

Charles


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