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[Matthew Carpenter <matt@xxxxxxxxx>]

I'm running into this problem on Ubuntu 15.10 as well.  I originally
didn't realize it was the *locked* session that caused difficulties.  I
just noticed that when my kids logged on, after a half hour the system
would power down.  This is because compiz at 100%+ CPU heated up the CPU
to 114C within that time period.  I was tracking lm-sensors output,
logs, and finally top, all at the same time, through SSH sessions from
another system.  I just now determined that it was compiz, only when
locked.  (btw, media servers with RAID-5 arrays is not the machine you
want to hard-power-down repeatedly).

Any hopes for a fix?

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https://bugs.launchpad.net/bugs/1322751

Title:
  Compiz running on Intel Haswell GPU has 100% CPU usage when computer
  is locked

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