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 <cladisch@xxxxxxxxxxxxxx> 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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