Comment 7 for bug 156013

OK. So it's definitely an alsa bug. I recompiled the latest alsa (1.0.15) following https://help.ubuntu.com/community/HdaIntelSoundHowto (just substitute 15 to 14 in the version number used there), and sound works perfetly : from speakers when no headphone plugged, from headphones when plugged.

Is this kind of bug which make sound unusable on a full range of laptops enough to warrant an upgrade to latest alsa ?