To avoid going too below the warning level we set the volume when showing the warning dialog to the loud_volume level.
The spec states:
Whenever you increase volume, for the first time in 20 hours, such that acoustic output would be more than 85 dBA, an “Increase Volume” dialog should appear.
So the loud_volume is still a valid level.
After setting this the user has only to press the Up button once to show the warning dialog again.
When setting the loud_volume-1 value the level was decreased 2 steps below the warning level and the used had to press the up button twice.
Approved by: PS Jenkins bot, Charles Kerr