How to fix large debug_log and btsnoop_hci.log on Xiaomi Redmi 4 Pro / Prime

Large btsnoop_hci.log solution

After using the Bluetooth the log file btsnoop_hci.log is created in user partition. Everything that being transferred by Bluetooth is written into this log. In some cases btsnoop_hci.log size is calculated in gigabytes (especially if you’re listening to music via Bluetooth).

The solution is simple (root is required):

1. Open /etc/bluetooth/bt_stack.conf
2. Search for these two lines and change them both to “false”. Should look like this:

   BtSnoopLogOutput=false
   BtSnoopExtDump=false

3. Reboot your device. Nothing will be written into bt_stack.conf anymore.

Large debug_log folder

In user partition, inside the MIUI folder the debug_log is created and it keeps growing in size and constantly writes some logs.

The solution is to create an empty file (root is not required):

1. Inside MIUI folder, delete debug_log folder.
2. Now instead of debug_log folder create empty file with the same name “debug_log”.
3. The issue is solved. No useless and large logs anymore.

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