A good source of information could be found in this page, but none of them worked for me.

The most useful article I found was on xda and here’s the solution:

• enable

  echo 0 > /sys/module/logger/parameters/log_mode
  

• enable at boot, but not when suspended

  echo 1 > /sys/module/logger/parameters/log_mode
  

• completely disabled:

  echo 2 > /sys/module/logger/parameters/log_mode
  

(you need a rooted device)