Hi,
I previously posted in alsa user mailing list about a problem I was facing with having no sound and the systemd journal filling when using headphones:
http://article.gmane.org/gmane.linux.alsa.user/38948
I subsequently realised that I had enabled power-saving a few weeks ago and it was this power-saving that was causing the problem. My response to myself is here:
http://article.gmane.org/gmane.linux.alsa.user/38953
I am now satisfied that disabling power-saving has resolved my issue, but there has been a suggestion that I report this issue, so here it is. Apologies if this is the wrong place (this is my first time on the alsa mailing list).
Let me know if you want me to create a bug ticket and where it should be created (the bug tracker URL link in the alsa project page is not working).