Headset loud warning issues when the screen is blank

STEPS:
This is a behavioural bug and may require input from design.

1. Install the latest rc-proposed image
2. Plug in a wired headset
3. Play some music
4. Tap on cancel the the volume is dropped below the acceptable level
5. Blank the screen
6. Tap the volume up button

EXPECTED:
I expect something to tell me I need to wake the phone to accept the policy so the volume raises above the 50% level

ACTUAL:
The popup appear but gives no indication that it is there so you have no idea why the volume isn't increasing.

POSSIBLE SOLUTIONS:
1. An audible ping so you know that this volume up is doing something different
2. Wake the screen so the information is visible, only issue here is that the cancel or accept button might be pressed so then there is no idea why it didn't work
3. Flash the led like you do for messages to get the users attention.