1. Remove your account from audio group. Commands:
> group
Check for "audio" group. If you see it:
> sudo deluser your_user_name audio
Removes "your_user_name" user from "audio" group. You need to logout/reboot.

It is very rare to need to have your user in audio group.
https://wiki.ubuntu.com/Audio/TheAudioGroup

2. Alternative. You can install "indicator-sound" package to sound indicator at 
login screen.
Open /etc/lightdm/lightdm-gtk-greeter.conf and edit "indicators" or 
"show-indicators" option: add "sound" to it.
indicators=list;of;indicators;on;login;screen;sound
This indicator saves its state between sessions and reboots. But it <can> 
affect your session settings.

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https://bugs.launchpad.net/bugs/1458933

Title:
  No volume control on screen lock - Volume goes to 100%

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