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[V-Mark <vertesmark@xxxxxxxxx>]

I do not know if this helps, but immediately after IDLE (screen off):
top with separated CPU-s:

top - 14:38:27 up  6:39,  3 users,  load average: 0,70, 0,32, 0,21
Tasks: 200 total,   1 running, 199 sleeping,   0 stopped,   0 zombie
%Cpu0  :  0,7 us,  1,0 sy,  0,0 ni, 98,3 id,  0,0 wa,  0,0 hi,  0,0 si,  0,0 st
%Cpu1  :  0,0 us,  0,7 sy,  0,0 ni, 98,7 id,  0,3 wa,  0,0 hi,  0,3 si,  0,0 st
%Cpu2  :  1,0 us,  0,0 sy,  0,0 ni, 99,0 id,  0,0 wa,  0,0 hi,  0,0 si,  0,0 st
%Cpu3  : 34,9 us, 65,1 sy,  0,0 ni,  0,0 id,  0,0 wa,  0,0 hi,  0,0 si,  0,0 st
KiB Mem:   8211348 total,  3645980 used,  4565368 free,   108936 buffers
KiB Swap:  7844308 total,        0 used,  7844308 free.  2569852 cached Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND          
 1396 mark      20   0  288756 114788  70772 S 100,8  1,4 120:45.68 compiz           
 1800 mark      20   0  866636 332252  78480 S   0,3  4,0  13:16.19 firefox          
 4454 mark      20   0  125108  34428  26224 S   0,3  0,4   0:13.64 gnome-terminal-  
 5850 root      20   0       0      0      0 S   0,3  0,0   0:04.45 kworker/0:2      
 6878 mark      20   0    7172   2832   2364 R   0,3  0,0   0:00.23 top              
    1 root      20   0   24884   4848   3716 S   0,0  0,1   0:01.49 systemd          
    2 root      20   0       0      0      0 S   0,0  0,0   0:00.00 kthreadd         
    3 root      20   0       0      0      0 S   0,0  0,0   0:00.70 ksoftirqd/0      
    5 root       0 -20       0      0      0 S   0,0  0,0   0:00.00 kworker/0:0H     
    7 root      20   0       0      0      0 S   0,0  0,0   0:08.01 rcu_sched        
    8 root      20   0       0      0      0 S   0,0  0,0   0:00.00 rcu_bh           

So compiz is occupying one of my core 100% only DURING IDLE (screen off)

Mark

** Summary changed:

- compiz HIGH CPU usage only during AFK
+ compiz HIGH CPU usage only during screen is off

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https://bugs.launchpad.net/bugs/1511727

Title:
  compiz HIGH CPU usage only during screen is off

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