Re: [gentoo-user] No sound. Please, help!

[gevisz]

чт, 14 июл. 2022 г. в 10:53, Michael <confabulate@××××××××.com>:
>
> On Thursday, 14 July 2022 07:19:14 BST gevisz wrote:
> > пт, 11 мар. 2022 г. в 20:15, gevisz <gevisz@×××××.com>:
> > > пн, 19 окт. 2020 г. в 00:15, gevisz <gevisz@×××××.com>:
> > > > вс, 18 окт. 2020 г. в 21:15, Dale <rdalek1967@×××××.com>:
> > > > > gevisz wrote:
> > > > > > вс, 18 окт. 2020 г. в 17:20, Dale <rdalek1967@×××××.com>:
> > > > > >> gevisz wrote:
> > > > > >>> No sound at least in Firefox. Tried it on youtube. Skype is
> > > > > >>> currently
> > > > > >>> uninstalled. So, I cannot check using it.
> > > > > >>
> > > > > >> Just a thought.  Are you sure that everything is unmuted?  Years
> > > > > >> ago,
> > > > > >> all the sound control software, Kmix, alsa and others, default to
> > > > > >> mute.
> > > > > >> If just one of them is muted, no sound.  I seem to recall when I
> > > > > >> did my
> > > > > >> install on this rig that I had to unmute the sound in three places,
> > > > > >> Kmix, alsa and one other that I can't recall the name of.  I think
> > > > > >> I had
> > > > > >> to turn up the volume on alsa as it was set to a really low level
> > > > > >> once
> > > > > >> it was unmuted.  Usually, I turn all of them to the max except the
> > > > > >> one I
> > > > > >> mainly use.  In my case, Kmix is the one I use to really control
> > > > > >> things
> > > > > >> since it sits on the panel thingy.  The others are set at the max.
> > > > > >>
> > > > > >> It's a silly thing but thought it worth a mention just in case
> > > > > >> there is
> > > > > >> a muted setting somewhere.
> > > > > >
> > > > > > Thank you for your input. Yes, it seems that something is muted but
> > > > > > what?
> > > > > > I have no KDE and no kmix installed. No pulseaudio.
> > > > >
> > > > > Type in alsamixer in a console or whatever you use and hit tab twice.
> > > > > I
> > > > > suspect you have that installed.  You should have a text version, like
> > > > > a
> > > > > console uses, and a gui version, that should work in any DM.  Pick
> > > > > your
> > > > > poison and see if anything there is muted or the volume is set really
> > > > > low, like 1 out of 100 or something.  I think hitting the "m" key
> > > > > toggles the mute.
> > > >
> > > > I am sorry to confess that I forgot that I should use M to unmute
> > > > a channel in alsamixer (as I did about 14 years ago) and thought
> > > > that arrows up and down do all the work. :(
> > > >
> > > > So, now the problem has been solved.
> > >
> > > Last time I have ended the discussion on my
> > > "no sound" problem acknowledging that I was
> > > so stupid that "forgot that I should use M to
> > > unmute a channel in alsamixer."
> > >
> > > However, it turned out that it was not the case:
> > > currently I have all channels in alsamixer unmuted
> > > and have sound only in about 1 from 10 bootings of
> > > my Gentoo system, while I do always have sound
> > > on the same computer while I boot it with Ubuntu 20.04.
> > >
> > > I have also compared the output of lsmod command
> > > on both systems and found out that my Gentoo system
> > > had all sound kernel modules that my Ubuntu system has
> > > and even more. (In Gentoo, I still have quite an old 5.4.97
> > > kernel, but I do not think that it is the cause of my
> > > "no sound" problem.)
> > >
> > > Of course, it is completely my responsibility that
> > > I have built my Gentoo system in such a way that
> > > I never know if I will have sound after its next boot.
> > > However I am lost guessing what I did wrong.
> > > (Comparing with Ubuntu 20.04, my Gentoo system
> > > has no systemd and no pulseaudio, no consolekit,
> > > and no policykit.)
> > >
> > > I leave this just for history, as I am currently
> > > in a war zone and so investigating this problem
> > > further is not in my priority list. :(
> >
> > I have accidentally found that the problem with
> > absence of sound on my Gentoo box appears
> > only when my USB Logitech webcam is connected
> > to the computer during the boot time.
> >
> > Moreover, if it happens and the sound is absent,
> > the alsamixer shows that my USB Logitech webcam
> > is considered by the system as a default sound device.
> >
> > So, it tries to send sound there even though it does
> > not have any speaker.
>
> I'll blame some relatively recent change in the kernel
> or some interaction with udev.

Yes, it is quite probable that udev, evdev or the like
is responsible for the problem.