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 -- You received this bug notification because you are a member of compiz packagers, which is subscribed to compiz in Ubuntu. https://bugs.launchpad.net/bugs/1322751 Title: Compiz running on Intel Haswell GPU has 100% CPU usage when computer is locked To manage notifications about this bug go to: https://bugs.launchpad.net/compiz/+bug/1322751/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~compiz Post to : [email protected] Unsubscribe : https://launchpad.net/~compiz More help : https://help.launchpad.net/ListHelp
