[pulseaudio-discuss] X-Fi Surround USB 5.1 crackling noise

[Tanu Kaskinen]

On Sat, 2015-11-28 at 14:32 +0100, Thomas Martitz wrote:
> Hello,
> 
> I'm writing because I suffer from intermittent cackling noise on my X-Fi 
> Surround USB 5.1 sound card. I've found that it's long known[1].
> 
> I found that I can fix the noise by disabling realtime sceduling. So I 
> my daemon.conf looks like this:
> 
> cat ~/.config/pulse/daemon.conf
> default-sample-rate = 48000
> alternate-sample-rate = 44100
> default-sample-format = s16le
> realtime-scheduling = no
> 
> Does that ring a bell to anyone?

Not to me.

> And what are expected drawbacks from 
> disabling this?

Increased risk of underruns in the alsa ringbuffer (meaning gaps in
audio), because pulseaudio may not get woken up in time to fill the
buffer (or may get interrupted while working on filling the buffer).

-- 
Tanu