T450s no sound - randomly witches sound output to "2nd Output" (PICS)

[hyde]

I having a strange problem, which I suspect might be due to "Deep Sleep Mode" although I will have to test it a couple more times.
I noticed time to time my sound output switches to "Realtek HD Audio 2nd output" without any switching on my part.


I can see the sound indicator (level) going up and down when I playing and music or video file, but I am not sure where it's sending that sound.




When I switch back to Speaker/HP by hitting that little arrow, I can get the system sounds (ding when adjusting volume) but nothing else, rest still seems to be routed to "2nd output".

[hyde]

Does anyone have an idea what could be the reason for this? It happened again, even after a restart, the moment I put it to sleep, upon wake up, sound is gone..