https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233400

--- Comment #23 from verma...@interia.pl ---
(In reply to Alex S from comment #19)

I recently got FreeBSD installed also on that W520, it also has the same
Conexant CX20590 sound chip but on W520 it works like a charm ...

I assume that as T420s needs these below in the /boot/device.hints file just to
gest jack/headphones output there are probably other 'quirks' for T420s that
made it work not so reliably ... or W520 has other 'quirks' then T420s. Also
T520 and X220 work ok on FreeBSD so probably only T420s is problematic.

# tail -5 /boot/device.hints

# T420s SOUND ON HEADPHONES
hint.hdaa.0.nid31.config="as=1"
hint.hdaa.0.nid25.config="as=1 seq=15 device=Headphones mute=0 misc=0"
hint.hdaa.0.nid28.config="as=1 seq=15 device=Headphones mute=0 misc=0"

Regards.

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