iPad stuck
How do I get it to go to landscape mode? It used to switch back and forth depending on the position it was in.
iPad, iOS 9
If you have an older model iPad, it will have a physical side-switch on the edge. This switch can be configured, in Settings, the either activate the Rotation Lock - or to Mute the sound on your iPad.
Try flipping the physical switch to the other position.
Configuration of this feature can be found here:
Settings > General > [User Side Switch To] - select Lock Rotation or Mute
I hope this is helpful in resolving the problem.