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[V-Mark <vertesmark@xxxxxxxxx>]

I faced exaclty the same problem with my system.
I already reported ad bug, now linked to this bug as duplicate.

Again, I confirm (for me):
- When I switch off "screen lock" and wait for screen fades out problem does NOT happen.
- In contrast if I lock screen manually (eg.: Alt-Ctrl-L or xdg-screensaver lock from x-terminal) compiz occupies one core 100%. Due to this fan starts.

I also tested: the  https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/969860
but it does not solve my problem, because compiz 100% CPU usage is not linked with power saving of monitor, but lock screen.

My data:
- Fresh install of Ubuntu 15.10 (plus some other non-desktop or gnome related packages)
- All energy consumption related settings are default (I have not changed them till now).
- Laptop: ACER Aspire V3-371
- CPU: Intel Core i5-5257U
- GPU: Intel Iris grapics 6100
- Display: 1920x1080 internal laptop display, no other display ever plugged in.
- 8G RAM
- 120G SSD

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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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