I am having Motorola Milestone xt720 (android 2.1) in which orientation doesn't work automatically but if i enabled it and if the screen is in landscape mode then it continuously remain in landscape..so have to disable it manually to get back into normal mode.
Checking using AndroSensor it reports :
Accelerometer: Failed to start :Unknown error
Orientation : Failed to start :Unknow error
So is it a hardware problem or some application problem ?
