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[Darla <untrammeled@xxxxxxxxx>]

Public bug reported:

I upgraded to vivid 15.04 on my HP Sleekbook (AMD A10 CPU) and it runs
very hot. Top shows kworker taking up 60-70% CPU immediately after
rebooting and not launching any programs.

  top - 17:27:55 up 10 min,  3 users,  load average: 2.93, 2.75, 1.51
Tasks: 205 total,   3 running, 202 sleeping,   0 stopped,   0 zombie
%Cpu(s): 22.8 us, 35.5 sy,  0.0 ni, 39.5 id,  0.2 wa,  0.0 hi,  1.9 si,  0.0 st
KiB Mem:   5233588 total,  4715036 used,   518552 free,    56484 buffers
KiB Swap:  5468156 total,        0 used,  5468156 free.   689644 cached Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND     
   97 root      20   0       0      0      0 R  66.0  0.0   6:13.97 kworker/2:3 
 3512 darla     20   0 1020444 320036  61580 S  45.8  6.1   2:02.92 chrome      
   22 root      20   0       0      0      0 S  34.2  0.0   3:08.83 ksoftirqd/2 
 3493 darla     20   0 2868728 1.492g  39876 S  30.5 29.9   2:04.76 chrome      
 1033 root      20   0  351108 136976  90380 R  24.9  2.6   1:46.40 Xorg        
 3311 darla     20   0 1085248 205976  90288 S  17.6  3.9   1:26.52 chrome      
 2479 darla      9 -11  630432  10824   7760 S   6.3  0.2   0:13.21 pulseaudio  
 3342 darla     20   0 1109672 332000 135212 S   5.6  6.3   0:29.85 chrome      
 3467 darla     20   0  959564 184012  60188 S   3.0  3.5   0:21.64 chrome      
   77 root      20   0       0      0      0 S   1.7  0.0   0:08.37 kworker/1:1 
 2697 darla     20   0  388040  24652  18852 S   1.7  0.5   0:00.85 xfce4-term+ 
 3483 darla     20   0 1039356 209628  64692 S   1.7  4.0   0:23.44 chrome      
 3561 darla     20   0  879172 146972  64124 S   1.0  2.8   0:07.04 chrome      
   50 root      20   0       0      0      0 S   0.7  0.0   0:05.24 kworker/0:1

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

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https://bugs.launchpad.net/bugs/1462108

Title:
  kworker high cpu utilization

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I upgraded to vivid 15.04 on my HP Sleekbook (AMD A10 CPU) and it runs
  very hot. Top shows kworker taking up 60-70% CPU immediately after
  rebooting and not launching any programs.

    top - 17:27:55 up 10 min,  3 users,  load average: 2.93, 2.75, 1.51
  Tasks: 205 total,   3 running, 202 sleeping,   0 stopped,   0 zombie
  %Cpu(s): 22.8 us, 35.5 sy,  0.0 ni, 39.5 id,  0.2 wa,  0.0 hi,  1.9 si,  0.0 st
  KiB Mem:   5233588 total,  4715036 used,   518552 free,    56484 buffers
  KiB Swap:  5468156 total,        0 used,  5468156 free.   689644 cached Mem

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND     
     97 root      20   0       0      0      0 R  66.0  0.0   6:13.97 kworker/2:3 
   3512 darla     20   0 1020444 320036  61580 S  45.8  6.1   2:02.92 chrome      
     22 root      20   0       0      0      0 S  34.2  0.0   3:08.83 ksoftirqd/2 
   3493 darla     20   0 2868728 1.492g  39876 S  30.5 29.9   2:04.76 chrome      
   1033 root      20   0  351108 136976  90380 R  24.9  2.6   1:46.40 Xorg        
   3311 darla     20   0 1085248 205976  90288 S  17.6  3.9   1:26.52 chrome      
   2479 darla      9 -11  630432  10824   7760 S   6.3  0.2   0:13.21 pulseaudio  
   3342 darla     20   0 1109672 332000 135212 S   5.6  6.3   0:29.85 chrome      
   3467 darla     20   0  959564 184012  60188 S   3.0  3.5   0:21.64 chrome      
     77 root      20   0       0      0      0 S   1.7  0.0   0:08.37 kworker/1:1 
   2697 darla     20   0  388040  24652  18852 S   1.7  0.5   0:00.85 xfce4-term+ 
   3483 darla     20   0 1039356 209628  64692 S   1.7  4.0   0:23.44 chrome      
   3561 darla     20   0  879172 146972  64124 S   1.0  2.8   0:07.04 chrome      
     50 root      20   0       0      0      0 S   0.7  0.0   0:05.24 kworker/0:1

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