Interestingly I also have this problem, but with an nVidia card (NVIDIA
Coporation GT215 Quadro FX 880M rev a2) in my Thinkpad, using the
nouveau driver!
I'm using kubuntu 12.04, upgraded step by step from Lucid, and this
problem happens since going to 12.04.
First I had the nvidia driver
ok, in my case it seems to have indeed been a specific application. I killed it
- CPU usage was back to normal. Memory was not freed though. I am not sure if
this application hasn't been updated between 11.10 and 12.04, so I cannot say
if a change in xorg or a change in teh application caused
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