In Samsung Galaxy Tab 2, auto rotation of screen is by default disabled. Tab 2 users can turn on auto rotation using the option provided as part of the Settings.
Step 1: Access the Samsung Tab 2 settings screen.
Step 2: In the Settings screen, tab the Accessibility settings under System section.
Step 3: Navigate to System section under Accessibility settings and tap the check box with caption as Auto-rotate screen.
Now when the device orientation changes, automatically the screen rotates.