dbus-monitor --session "type=signal,interface=com.canonical.Unity.Session,member=Unlocked" | \
{
    while read MSG; do
        logger "dbus-lock-screen-timer $MSG"
        LOCK_STAT=`echo $MSG | awk '{print $NF}'`
        if [[ "$LOCK_STAT" == "member=Unlocked" ]]; then
            logger "Screen unlocked"
            lock-screen-timer
        fi
    done
}

rick@dell:~/bin$ lsblk -f
NAME   FSTYPE LABEL           UUID                                 MOUNTPOINT
sdb
├─sdb2 ext4   ST9_Linux       bf80a37d-dfad-4df1-b8b1-a67ef2a9ab66
├─sdb3 swap                   f7ca38bd-ccf1-4d61-b54b-017b1493d1b4
└─sdb1 ntfs   ST9_Win7        C2F48A08F489FF43
sr0
sdc
├─sdc2 ntfs   F9m_Win7        5824BF4E76D68BE2
├─sdc3 ext4   F9m_Linux       d02dc21d-dcb2-478e-9f7d-9a3331931de4 /
└─sdc4 swap                   09606fe6-c131-43fc-9ebc-be05a96e1c1d [SWAP]
sda
├─sda4
├─sda2 ntfs   KSX_Win7        2EBA8445BA840B91