/ sys / devices / platform / [ HOME SHELL ] 
Name Size Permission Action
  Fixed MDIO bus.0 [ DIR ] drwxr-xr-x  
  PNP0103:00 [ DIR ] drwxr-xr-x  
  alarmtimer [ DIR ] drwxr-xr-x  
  i8042 [ DIR ] drwxr-xr-x  
  pcspkr [ DIR ] drwxr-xr-x  
  power [ DIR ] drwxr-xr-x  
  serial8250 [ DIR ] drwxr-xr-x  
  uevent 4 KB -rw-r--r--   

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Change Permission : pcspkr