so i started a batch top capture and then minimized all my windows
(including top capture shell ), system hangs for more than 5 seconds
before i can click anything, then i open restore top capture shell

top -b > top.log

grep PID -A 10 top.log

here's some interesting output when all windows minimized , note only
middle entries are the relevant parts to the bug

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
                                                                                
                     
 9880 rhuddusa  10 -10 1021m  41m  28m S    6  0.5   3:45.07 vlc                
                                                                                
                     
 3925 rhuddusa  21   1  854m 204m  47m S    4  2.6   6:00.96 chrome             
                                                                                
                     
 4942 rhuddusa  20   0  922m  86m  22m S    2  1.1   4:33.05 chrome             
                                                                                
                     
11039 rhuddusa  20   0 17336 1316  916 R    2  0.0   0:00.01 top                
                                                                                
                     
21595 root      20   0  335m 233m  28m S    2  2.9  77:41.10 Xorg               
                                                                                
                     
22500 rhuddusa  20   0 1280m 266m  49m S    2  3.3  45:12.97 compiz             
                                                                                
                     
22527 rhuddusa   0 -20  410m 6992 4828 S    2  0.1   6:33.12 pulseaudio         
                                                                                
                     
    1 root      20   0 24456 2444 1380 S    0  0.0   0:01.85 init               
                                                                                
                     
    2 root      20   0     0    0    0 S    0  0.0   0:00.04 kthreadd           
                                                                                
                     
    3 root      20   0     0    0    0 S    0  0.0   0:03.93 ksoftirqd/0        
                                                                                
                     
--
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
                                                                                
                     
21595 root      20   0  340m 238m  33m R   23  3.0  77:41.79 Xorg               
                                                                                
                     
22500 rhuddusa  20   0 1280m 266m  49m R   16  3.3  45:13.45 compiz             
                                                                                
                     
 9880 rhuddusa  10 -10 1021m  41m  28m S    5  0.5   3:45.23 vlc                
                                                                                
                     
10935 rhuddusa  20   0  522m  16m  10m S    4  0.2   0:00.88 gnome-terminal     
                                                                                
                     
11015 rhuddusa  20   0  937m 119m  24m S    3  1.5   0:02.41 chrome             
                                                                                
                     
22527 rhuddusa   0 -20  410m 6992 4828 S    3  0.1   6:33.21 pulseaudio         
                                                                                
                     
 3925 rhuddusa  21   1  859m 203m  47m S    1  2.6   6:01.00 chrome             
                                                                                
                     
22535 rhuddusa  20   0  431m  11m 7320 S    1  0.1   2:26.00 bamfdaemon         
                                                                                
                     
22542 rhuddusa  20   0  293m  12m 8016 S    1  0.2   1:52.52 gtk-window-deco    
                                                                                
                     
22481 rhuddusa  20   0 1072m 370m  11m S    1  4.6   5:37.78 gnome-settings-    
                                                                                
                     
--
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
                                                                                
                     
21595 root      20   0  340m 238m  33m R   83  3.0  77:44.30 Xorg               
                                                                                
                     
22535 rhuddusa  20   0  431m  11m 7320 S   38  0.1   2:27.16 bamfdaemon         
                                                                                
                     
10935 rhuddusa  20   0  522m  16m  10m S   23  0.2   0:01.56 gnome-terminal     
                                                                                
                     
22500 rhuddusa  20   0 1280m 266m  49m S   23  3.3  45:14.13 compiz             
                                                                                
                     
22471 rhuddusa  20   0 26184 2472  624 R   17  0.0   0:21.52 dbus-daemon        
                                                                                
                     
22542 rhuddusa  20   0  293m  12m 8016 S   12  0.2   1:52.87 gtk-window-deco    
                                                                                
                     
22481 rhuddusa  20   0 1072m 370m  11m S    7  4.6   5:37.98 gnome-settings-    
                                                                                
                     
22553 rhuddusa  20   0  461m  16m  10m S    6  0.2   0:23.29 unity-panel-ser    
                                                                                
                     
 9880 rhuddusa  10 -10 1021m  41m  28m S    6  0.5   3:45.40 vlc                
                                                                                
                     
22555 rhuddusa  20   0  680m 4448 3424 R    4  0.1   0:02.47 hud-service        
                                                                                
                     
--
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
                                                                                
                     
21595 root      20   0  335m 233m  28m R   90  2.9  77:47.00 Xorg               
                                                                                
                     
22535 rhuddusa  20   0  431m  11m 7320 S   51  0.1   2:28.69 bamfdaemon         
                                                                                
                     
22471 rhuddusa  20   0 26184 2472  624 R   23  0.0   0:22.21 dbus-daemon        
                                                                                
                     
22542 rhuddusa  20   0  293m  12m 8016 R   19  0.2   1:53.45 gtk-window-deco    
                                                                                
                     
22500 rhuddusa  20   0 1280m 266m  49m S   19  3.3  45:14.70 compiz             
                                                                                
                     
10935 rhuddusa  20   0  522m  16m  10m S   17  0.2   0:02.07 gnome-terminal     
                                                                                
                     
22553 rhuddusa  20   0  461m  16m  10m S   12  0.2   0:23.66 unity-panel-ser    
                                                                                
                     
22481 rhuddusa  20   0 1072m 370m  11m S    7  4.6   5:38.19 gnome-settings-    
                                                                                
                     
 9880 rhuddusa  10 -10 1021m  41m  28m S    6  0.5   3:45.58 vlc                
                                                                                
                     
22555 rhuddusa  20   0  680m 4448 3424 S    6  0.1   0:02.65 hud-service        
                                                                                
                     
--
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
                                                                                
                     
21595 root      20   0  500m 398m  28m R   92  5.0  77:49.76 Xorg               
                                                                                
                     
22535 rhuddusa  20   0  431m  11m 7320 S   46  0.1   2:30.07 bamfdaemon         
                                                                                
                     
22471 rhuddusa  20   0 26288 2616  624 R   21  0.0   0:22.84 dbus-daemon        
                                                                                
                     
22500 rhuddusa  20   0 1280m 266m  49m R   19  3.3  45:15.27 compiz             
                                                                                
                     
22542 rhuddusa  20   0  293m  12m 8016 R   18  0.2   1:53.99 gtk-window-deco    
                                                                                
                     
10935 rhuddusa  20   0  522m  16m  10m R   17  0.2   0:02.58 gnome-terminal     
                                                                                
                     
22553 rhuddusa  20   0  461m  16m  10m S   14  0.2   0:24.08 unity-panel-ser    
                                                                                
                     
22481 rhuddusa  20   0 1072m 370m  11m S    6  4.6   5:38.38 gnome-settings-    
                                                                                
                     
22555 rhuddusa  20   0  680m 4448 3424 S    6  0.1   0:02.83 hud-service        
                                                                                
                     
 9880 rhuddusa  10 -10 1021m  41m  28m S    5  0.5   3:45.74 vlc                
                                                                                
                     
--
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
                                                                                
                     
21595 root      20   0  505m 403m  28m R   86  5.1  77:52.35 Xorg               
                                                                                
                     
22535 rhuddusa  20   0  431m  11m 7320 S   47  0.1   2:31.48 bamfdaemon         
                                                                                
                     
22500 rhuddusa  20   0 1280m 266m  49m S   25  3.3  45:16.02 compiz             
                                                                                
                     
10935 rhuddusa  20   0  522m  16m  10m S   24  0.2   0:03.30 gnome-terminal     
                                                                                
                     
22471 rhuddusa  20   0 26288 2616  624 S   23  0.0   0:23.52 dbus-daemon        
                                                                                
                     
22553 rhuddusa  20   0  461m  16m  10m S   16  0.2   0:24.57 unity-panel-ser    
                                                                                
                     
22542 rhuddusa  20   0  293m  12m 8016 S   12  0.2   1:54.35 gtk-window-deco    
                                                                                
                     
22481 rhuddusa  20   0 1072m 370m  11m S    7  4.6   5:38.58 gnome-settings-    
                                                                                
                     
 9880 rhuddusa  10 -10 1021m  41m  28m S    6  0.5   3:45.91 vlc                
                                                                                
                     
22555 rhuddusa  20   0  680m 4448 3424 S    3  0.1   0:02.93 hud-service        
                                                                                
                     
--
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
                                                                                
                     
21595 root      20   0  505m 403m  28m R   99  5.1  77:55.32 Xorg               
                                                                                
                     
22535 rhuddusa  20   0  431m  11m 7320 S   11  0.1   2:31.80 bamfdaemon         
                                                                                
                     
22500 rhuddusa  20   0 1280m 267m  49m S   10  3.4  45:16.33 compiz             
                                                                                
                     
22471 rhuddusa  20   0 26236 2628  624 S    6  0.0   0:23.70 dbus-daemon        
                                                                                
                     
 9880 rhuddusa  10 -10 1021m  41m  28m S    3  0.5   3:46.00 vlc                
                                                                                
                     
22553 rhuddusa  20   0  461m  16m  10m S    2  0.2   0:24.64 unity-panel-ser    
                                                                                
                     
22542 rhuddusa  20   0  293m  12m 8016 S    2  0.2   1:54.41 gtk-window-deco    
                                                                                
                     
10935 rhuddusa  20   0  522m  16m  10m S    2  0.2   0:03.35 gnome-terminal     
                                                                                
                     
11015 rhuddusa  20   0  930m  94m  19m S    1  1.2   0:02.63 chrome             
                                                                                
                     
22527 rhuddusa   0 -20  410m 6992 4828 S    1  0.1   6:33.57 pulseaudio         
                                                                                
                     
--
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
                                                                                
                     
22535 rhuddusa  20   0  431m  11m 7320 S   59  0.1   2:33.59 bamfdaemon         
                                                                                
                     
22500 rhuddusa  20   0 1280m 268m  49m S   46  3.4  45:17.71 compiz             
                                                                                
                     
22471 rhuddusa  20   0 26236 2628  624 S   33  0.0   0:24.68 dbus-daemon        
                                                                                
                     
21595 root      20   0  505m 403m  28m S   19  5.1  77:55.89 Xorg               
                                                                                
                     
22553 rhuddusa  20   0  461m  16m  10m S    9  0.2   0:24.91 unity-panel-ser    
                                                                                
                     
 9880 rhuddusa  10 -10 1021m  41m  28m S    5  0.5   3:46.14 vlc                
                                                                                
                     
22527 rhuddusa   0 -20  410m 6992 4828 S    3  0.1   6:33.67 pulseaudio         
                                                                                
                     
11015 rhuddusa  20   0  930m  94m  19m S    2  1.2   0:02.69 chrome             
                                                                                
                     
11039 rhuddusa  20   0 17344 1340  932 R    1  0.0   0:00.08 top                
                                                                                
                     
 3925 rhuddusa  21   1  854m 204m  47m S    0  2.6   6:01.36 chrome             
                                                                                
                     
--
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
                                                                                
                     
22535 rhuddusa  20   0  431m  11m 7320 S   46  0.1   2:34.97 bamfdaemon         
                                                                                
                     
22471 rhuddusa  20   0 26236 2628  624 S   28  0.0   0:25.51 dbus-daemon        
                                                                                
                     
22500 rhuddusa  20   0 1280m 268m  49m S   27  3.4  45:18.52 compiz             
                                                                                
                     
21595 root      20   0  505m 403m  28m R   21  5.1  77:56.53 Xorg               
                                                                                
                     
 9880 rhuddusa  10 -10 1021m  41m  28m S    4  0.5   3:46.27 vlc                
                                                                                
                     
22527 rhuddusa   0 -20  410m 6992 4828 S    3  0.1   6:33.75 pulseaudio         
                                                                                
                     
11015 rhuddusa  20   0  930m  94m  19m S    1  1.2   0:02.72 chrome             
                                                                                
                     
 4183 rhuddusa  21   1 1214m  43m  10m S    0  0.5  17:33.92 chrome             
                                                                                
                     
 9977 root      20   0     0    0    0 S    0  0.0   0:00.37 kworker/6:1        
                                                                                
                     
10935 rhuddusa  20   0  522m  16m  10m S    0  0.2   0:03.36 gnome-terminal

-- 
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https://bugs.launchpad.net/bugs/995716

Title:
  Unity (launcher, panel) becomes unresponsive when all windows are
  minimized

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