auto rotation option

hi prajwal,

thanks for your response, but I've done it just right now but still, the screen does not rotate.

I've tried rotate it while in full flip( keyboard on the back of the monitor?) left side , right side and upside down. but the screen did not move nor rotate.

is there any botton or option that I need to turn on the auto rotate option? or is it really automatic and need not to check the check box , or turn on the auto rotate option?

I just bought my Dell inspiron 13 , last June 13 2015.