Re: pulseaudio / alc1220 sound clicks interruptions etc

On Wed, Jun 4, 2025 at 7:15 PM Christos Margiolis <christos@freebsd.org> wrote:
>
> Amar Takhar wrote:
> > On 2025-06-04 18:50 +0200, Christos Margiolis wrote:
> > >
> > > I cannot really see a clear pattern here, but I think we can try to
> > > narrow down the issue. What is the behavior if you use _only_ plain OSS?
> > > No pulseaudio, ALSA, virtual_oss, etc.
> > >
> > > Also, do you vchanrate for both recording and playback? If not, that
> > > could be an issue as well (see BUGS section in sound(4)'s man page [1]).
> >
> > I'm pretty sure he has hit this same issue I've had for years now:
> >
> >   https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263385
> >
> > I've tried everything, OSS, external USB DAC, PulseAudio .. all of it has the
> > same issues.  It's worse in firefox/chrome especially for 4k video.
> >
> > I don't have a non-nvidia card to try in this machine so I'm not sure in the
> > driver but you can hear clicks for example when a keyframe switch happens.
> > Anything that causes a lot of video refresh creates the clicks they are softer
> > at lower resolutions but more acute at higher.
> >
> > I'm still on an older 14.1 and have not updated I was going to try that soon but
> > none of the previous updates from 13 made any difference and two updates made it
> > worse.
>
> If this is a scheduling/video driver issue, I would say, definitely
> upgrade and test whether the problem is still present.
>
> As for the nvidia driver being a possible problem, does this happen if
> you play audio before starting the graphical environment in the first
> place, i.e., from a TTY?

For me sound plays okay from the console with no Xorg and no
PulseAudio on ALC1220 (i.e. ocp-curses module.xm) no clicks no
interruptions.. but the system is not loaded and the IO is correlated
with audio distortions (visually too but there are less annoying).

Will try running Xorg on SCFB without nvidia module loaded in a free
moment and report back.

Will try to get back my old RX580 for testing but this may take ~2
weeks to see how Xorg behaves on AMDGPU.

Thanks! :-)

-- 
CeDeROM, SQ7MHZ, http://www.tomek.cedro.info