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Facing lag issue like slow gnome problem in Ubuntu 20.04. System monitor shows one core of cpu using almost 100% but no process shows more than 2 % usage. Tried "top -o %CPU" and got the following result.

PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND                                                                                                                                   
 3597 root      20   0       0      0      0 R  72.1   0.0   1:14.53 kworker/0:4+kacpid                                                                                                                        
 2098 shivam    20   0 4636280 270316 110104 S   2.6   2.2   1:17.58 gnome-shell                                                                                                                               
 1786 shivam    20   0  877884  76444  47056 R   2.3   0.6   0:28.84 Xorg                                                                                                                                      
 3979 shivam    20   0  897328  52132  39396 S   1.1   0.4   0:00.49 gnome-terminal-                                                                                                                           
 3552 root      20   0       0      0      0 I   0.4   0.0   0:00.04 kworker/u8:10-events_unbound                                                                                                              
 4140 root      20   0   20756   3916   3156 R   0.4   0.0   0:00.02 top                                                                                                                                       
    1 root      20   0  169572  13708   8456 S   0.0   0.1   0:08.86 systemd                                                                                                                                   
    2 root      20   0       0      0      0 S   0.0   0.0   0:00.01 kthreadd                                                                                                                                  
    3 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 rcu_gp                                                                                                                                    
    4 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 rcu_par_gp                                                                                                                                
    5 root      20   0       0      0      0 I   0.0   0.0   0:38.51 kworker/0:0-kacpi_notify                                                                                                                  
    6 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 kworker/0:0H-kblockd                                                                                                                      
    7 root      20   0       0      0      0 I   0.0   0.0   2:35.31 kworker/0:1-events                                                                                                                        
    9 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 mm_percpu_wq                                                                                                                              
   10 root      20   0       0      0      0 S   0.0   0.0   0:00.03 ksoftirqd/0                                                                                                                               
   11 root      20   0       0      0      0 I   0.0   0.0   0:00.73 rcu_sched                                                                                                                                 
   12 root      rt   0       0      0      0 S   0.0   0.0   0:00.01 migration/0                                                                                                                               
   13 root     -51   0       0      0      0 S   0.0   0.0   0:00.00 idle_inject/0                                                                                                                             
   14 root      20   0       0      0      0 S   0.0   0.0   0:00.00 cpuhp/0                                                                                                                                   
   15 root      20   0       0      0      0 S   0.0   0.0   0:00.01 cpuhp/1                                                                                                                                   
   16 root     -51   0       0      0      0 S   0.0   0.0   0:00.00 idle_inject/1                                                                                                                             
   17 root      rt   0       0      0      0 S   0.0   0.0   0:00.24 migration/1                                                                                                                               
   18 root      20   0       0      0      0 S   0.0   0.0   0:00.75 ksoftirqd/1                                                                                                                               
   20 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 kworker/1:0H-kblockd   

Please help me to solve this issue.

  • Investigate system logs also. – FedonKadifeli Sep 16 at 7:36

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