Try the following:

Set the desired default volume with gnome-volume-control and store that
state as the default by running:

$ sudo alsactl store

To reset the volume to the default when the user logs out:

Create a shell script named alsa with the following content:

#!/bin/sh
/sbin/alsactl restore
exit 0

Put it in /etc/gdm/PostSession

-- 
Cannot change volume while on logon screen
https://bugs.launchpad.net/bugs/156169
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