The HP Elitebook is one of the best devices I ever used, but it has some serious issues with the screen rotation of the tablet. If you turn the screen around to use the pc as a tablet, you should be able to change the orientation of the screen with the rotate button.
In some cases, the screen rotates automatically, sometimes it does not, and the rotate button does not always work as expected.
This is what solved the issue for me:
- install the latest Intel HD video driver from the HP support site
- install or reinstall the HP Quick Launch button drivers from the same site