Problem: aplay under tty but no sound.  aplay under xorg+pulse is ok.  What has 
missed?

Tried store alsactl from xorg+pulse environment and restore to tty environment, 
restore without error messages, but still no sound.
When store again and compare found some part cannot be restored (see attached 
alsactl results highlight)
 
OS: Ubuntu 14.04, kernel 3.16.0-41, alsa 1.0.25, pulse 4.0 (under xorg)

Under both environment:
(1) aplay command used: aplay -D hw:0,7 test.wav
(2) File /etc/asound.conf and ~/.asoundrc do not exist.

Under tty environment:
(3) alsamixer was checked all channels have unmuted
 
------------------------------------------
Working - xorg+pulse:
------------------------------------------
        ...
        control.7 {
                iface CARD
                name 'HDMI/DP,pcm=7 Jack'
                value true
                comment {
                        access read
                        type BOOLEAN
                        count 1
                }
        }
        ...
        control.12 {
                iface PCM
                device 7
                name ELD
               
 value 
'10000b006d40000f000002000000000030e500004c472d424448540a2020202020097f070d1f071507503d07c00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'
                comment {
                        access 'read volatile'
                        type BYTES
                        count 95
                }
        }
------------------------------------------
Not Working - tty:
------------------------------------------
        ...
        control.7 {
                iface CARD
                name 'HDMI/DP,pcm=7 Jack'
                value false
                comment {
                        access read
                        type BOOLEAN
                        count 1
                }
        }
        ...
        control.12 {
                iface PCM
                device 7
                name ELD
                value ''
                comment {
                        access 'read volatile'
                        type BYTES
                        count 0
                }
        }
------------------------------------------                                      
  
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