Your Samsung Galaxy S phone’s compass is not working? Auto rotation is faulty? Check your hardware by dialing *#0*# – this is a factory test app for the phone. If the compass is broken there too, here’s how you can fix it: delete /data/system/ms3c_yamaha.cfg, and if there’s a backup file, delete it too, then reboot. If it won’t help, make sure the files are deleted and then run /system/bin/sensorcalibutil_yamaha from a root shell, follow the instructions and then reboot your phone.