Lenovo P520/Realtek ALC662 - front jack & mic in [FIXED]

Jaroslav Kysela perex at perex.cz
Fri Jun 5 11:44:34 CEST 2020

Dne 02. 06. 20 v 13:59 Jan Pokorny napsal(a):
> Problem solved!
> The solution was as simple as installing alsa-ucm package.
> (Extra credit to Mark Pearson for pointing some recent changes
> in that project out to me.)
> Color me very embarrassed.
> Perhaps the intention of keeping the package set minimal backfired
> (EDIT: nope, nothing seems to be actively associated with that
> package incl. opt-in ones), but frankly, have never needed this package,
> not even heard about it before.
> I wonder why there are no pointers anywhere, at least in alsa-info.sh
> output that would perhaps make the case clear for the experts amongst
> you.  Or somewhere else, where it could be raised as a suggestion:
>     It appears as if you have a card/coded that relies on UCM for it
>     to be used to the full extent, and UCM does not appear to be
>     installed.  Try installing that software, commonly packaged as
>     alsa-ucm.  Having it up-to-date may also help.
> [if not anything else, perhaps at least this makes it on-topic for
> the list]
> Perhaps even close relationship between alsa-utils and alsa-ucm,
> on the suggests/recommends level or something like that?
> On the whole it seems more enlightenment towards users is advisable,
> on more than one front, mainly for the ignorants like me :-)

Thanks for this analysis. Please, create a Fedora bug for this for the further 
analysis / fixes. The alsa-ucm is installed for the workstation GUIs:


See "Fedora Workstation", "LXDE Desktop", "LXQt Desktop" etc. All depends on 
the "multimedia" package group which contains alsa-ucm.

Anyway, it's a distro problem, so move the discussion to the right place.


Jaroslav Kysela <perex at perex.cz>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.

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