How to get logs :

LOGCAT:
from windows cmd or linux terminal ( must have android SDK installed )

1. adb shell
2. logcat > sdcard/logcat.txt


or from terminal on phone :

1.su
2. logcat > sdcard/logcat.txt


DMESG:
from windows cmd or linux terminal ( must have android SDK installed )

1. adb shell
2. dmesg > sdcard/dmesg.txt


or from terminal on phone :

1.su
2. dmesg > sdcard/dmesg.txt


LAST_KMSG:
from windows cmd or linux terminal ( must have android SDK installed )

1. adb shell
2. cat proc/last_kmsg > sdcard/last_kmsg.txt


or from terminal on phone :

1.su
2. cat proc/last_kmsg > sdcard/last_kmsg.txt



That's all folks...