Hi,

I'm in the process of enabling pm runtime pm for the hda_intel driver, not being sure if this is a sane task :). Noticed that CONFIG_SND_HDA_POWER_SAVE disables codecs and chip when they are not in use, but the power gain is not noticeable on my hw. On the other hand, a full suspend (azx_suspend) does save a few hundred mW's. I am aware that this is hw specific, but I would like to take advantage of the full suspend. Suspend/resume latency is below jiffy resolution.

How about a more aggressive scheme?: allow runtime power management (with azx_suspend/resume as runtime pm ops) to kick in when all streams are stopped/suspended/paused. And resume upon stream is start/resume. I don't have enough context into ALSA & sound drivers so I need a reality check: is this crazy/stupid?

Thanks, Dragos