Ok, I think I am getting closer. I had TLP installed to handle power
managment on the laptop. As part of my testing I purged that and the
problem went away. Reinstalled TLP and the problem came back.
So it has something to do with how TLP is configuring power management
...
** Also affects: tlp (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1189645
Title:
General lag under desktop environments
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