Comment # 32 on bug 905418 from Takashi Iwai

(In reply to haochuan chen from comment #30)
> I have the same problem on T420.
> 
> After removing these lines in
> /usr/share/pulseaudio/alsa-mixer/paths/analog-output-headphones.conf, the
> headphones work again.
> [Jack Dock Headphone]
> required-any = any

Yes, this cannot be fixed with PA 5.0.  I tried to fix, and this resulted in
more regressions, unfortunately.

Upgrade to PA 6.0 or 7.0 should work better for Thinkpads.  The packages are
available on OBS multimedia:libs repo.