Automatic Screen Rotation; Setting When To Turn Off The Screen; Screen Brightness - HTC One User Manual

The data connection resumes when you switch the screen back on.

Automatic screen rotation

Automatic rotation is not supported in all applications.
1. Go to Settings, and then tap Display & gestures.
2. Select or clear the Auto-rotate screen option to turn it on or off.

Setting when to turn off the screen

After a period of inactivity, the screen turns off to conserve battery power.
You can set the idle time before the screen turns off.
1. Go to Settings, and then tap Display & gestures.
2. Tap Screen timeout, and then tap the time before the screen turns
off.

Screen brightness

1. Go to Settings, and then tap Display & gestures.
2. Tap Brightness.
3. With the Automatic brightness option selected, drag the slider to
set the maximum brightness level. This sets a limit on how bright
the screen will be when Automatic brightness is selected.
Settings and security 303