One thing that many people have not been happy about in Android Lollipop is the removal of silent mode. The three new notification modes (None, Priority, and All) don’t allow you to mute the device while still letting alarms through. Priority Mode allows alarms to go off, but it also lets other things through. None Mode blocks absolutely everything, including alarms.
Android 5.1 is one step closer to bringing back silent mode. Now when you put the phone into Priority or None Mode you’ll get the option to have it disabled at your next alarm. In order to see this option you’ll need to have an alarm set to go off within the next 12 hours. This is the closest thing we have to silent mode right now, and it works pretty well. You can block notifications without worrying about your alarm being blocked, too.
To learn more about notification modes check out 15 Tips & Tricks for Android Lollipop and Top 10 Android Lollipop Features. Are you happy with this new feature?