Thanks so much, after digging more information found that nouveau was not in 
use due to 'nomodeset' set in /etc/default/grub.  Removed, ran update-grub2 and 
reboot fixed successfully.

> On 2015年9月1日, at 下午4:12, Clemens Ladisch <cladi...@googlemail.com> wrote:
> 
> laalaa wrote:
>> aplay under tty but no sound.  aplay under xorg+pulse is ok.
>> 
>>        control.7 {
>>                iface CARD
>>                name 'HDMI/DP,pcm=7 Jack'
> 
> For the HDMI audio output to work, the sound driver and the graphics driver
> have to work together.
> 
> 
> Regards,
> Clemens
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