Seems android-specific, not reproducable under mesa.
See excerpt from top with threads:
http://pastebin.ubuntu.com/12998801/
** Changed in: unity-system-compositor (Ubuntu)
Status: New => Confirmed
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** Changed in: unity-system-compositor (Ubuntu)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1511357
Title:
CPU hogging
Added Mir to affected projects since chances are this is a Mir problem
rather than a USC-specific problem.
** Also affects: unity-system-compositor
Importance: Undecided
Status: New
** Project changed: unity-system-compositor => mir
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It's probably this: https://bugs.launchpad.net/mir/+bug/1499039
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https://bugs.launchpad.net/bugs/1511357
Title:
CPU hogging when external
Well, even if it's that, should compositing ever do 40% CPU?
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https://bugs.launchpad.net/bugs/1511357
Title:
CPU hogging when external
*** This bug is a duplicate of bug 1499039 ***
https://bugs.launchpad.net/bugs/1499039
I meant lp:1499039 above.
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*** This bug is a duplicate of bug 1499039 ***
https://bugs.launchpad.net/bugs/1499039
Yep, duplicate of lp:499039, fixing lp:499039, USC cpu consumption (as
reported by top) goes down to normal when an external display is
connected.
** This bug has been marked a duplicate of bug 1499039
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