4 -install driver modules
10 -dynamic debug message
11 turn on CONFIG_DYNAMIC_DEBUG compiler flag for current kernel
12 mount -t debugfs none /sys/kernel/debug/
13 echo "module module_name +p" > /sys/kernel/debug/dynamic_debug/control(turn on debug messages, module name such as btmtk_usb)
14 echo "module module_name -p" > /sys/kernel/debug/dynamic_debug/control(turn off debug messages, module name such as btmtk_usb)