On Fri, 03 Apr 2015 08:44:12 +0800, Hui Wang said:
It sounds like the suspend or resume of power management introduces this problem. Probably you could reproduce this problem very soon just repeatedly suspend and resume the system.
I don't do suspend on this laptop, I poweroff and reboot when I get wherever I'm going.
However... device-level power management? Hmm.. I *do* remember that each time I found it dead, I was coming back to my laptop from doing something else, so the sound would have been idle....
commit c4c2533f802d6877803c4d778def43d8a122f27b Author: Takashi Iwai tiwai@suse.de Date: Tue Mar 3 17:22:12 2015 +0100
ALSA: hda - Fix possible runtime PM refcount unbalance
That landed in next-20150324 - which is broken for me.
Looks worth trying a revert before I bisect, thanks for the hint, will report back (probably tomorrow) on what happens...