Date: Wed, 4 Jun 2025 18:50:10 +0200 From: Christos Margiolis <christos@freebsd.org> To: Tomek CEDRO <tomek@cedro.info> Cc: freebsd-desktop@freebsd.org, freebsd-multimedia@freebsd.org Subject: Re: pulseaudio / alc1220 sound clicks interruptions etc Message-ID: <b3wwjs6arjalbhnwlm3aj72s4rjjdbxg2eynhq3hybglrskpgl@2wqjymjtd7m4> In-Reply-To: <CAFYkXj=%2Bby5B1H1yu1yuJJAGRmaAht0b1eSej=mLogVPimHxdg@mail.gmail.com>
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Tomek CEDRO wrote: > Hello world :-) > > I am experiencing really annoying sound clicks and glitches / > interruptions on FreeBSD that are hard to stand when using anything > beyond 16-bit 44.1kHz sound. At 48kHz glitches are rare but already > show up, at 96 and 192kHz sound is unusable. No problems like this on > windoze.There is one USB audio card (KM-BT1) that allows me to connect > over bluetooth headphones and it has the same issues. > > I played around with almost all systctl settings latency buffers > vchans bitperfects uadio params etc. It did not happen on the old > hardware. I am running Enlightenment wit PulseAudio backend. PCI-e > nvidia GTX1060 GPU. 14.2-RELEASE AMD64. > > Most likely PulseAudio is to blame as it also does some conversions on > the fly and may not catch up. Also played with most of the PA > daemon.conf settings with no good results, also in tandem with pcm > sysctl settings. When vchanmode is set to adaptive then PA > reconfrigures audio device to 16/44.1. When vchanmode is fixed and > both params of pcm and pa are the same glitches are unbearable and > their intensity corelates with applications use (i.e. switching > windows distrubs sound etc). > > Are there any limitations for 24/32-bit audio and samplerate over > 44.1kHz o n FreeBSD? > > Are there any tunables that may help OSS / PulseAudio run smoother? > > Are these known issues of ALC1220 sound codec? > > Should I run PulseAudio as system service so it gets realtime / nice > access? If so how to make it secure as there is no rc script for that? 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]). Christos [1] https://man.freebsd.org/cgi/man.cgi?query=sound&apropos=0&sektion=0&manpath=FreeBSD+15.0-CURRENT&arch=default&format=htmlhome | help
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