[pulseaudio-tickets] [Bug 99058] combine-sink: Very high buffer latency (sometimes)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99058

--- Comment #4 from Tanu Kaskinen <tanuk at iki.fi> ---
As one of the log messages says, "most likely the audio timing in one of your
drivers is broken", so this might not be a pulseaudio bug.

The first HDMI sink is having underruns all the time, and when the first "total
latency of output is very high" message is printed, the latency corresponds
roughly to the time since the first underrun. My guess would be that the first
HDMI sink is failing to consume almost any audio. The thread is not completely
stuck, but I would guess that writing each chunk of audio takes way too long.
Maybe it's the underrun recovery that's stalling?

To get any kind of certainty about what is happening, you could add more
logging to the alsa sink to see what is taking time. To avoid more spam in the
log than necessary, the extra logging could be enabled only once an underrun
has happened for at least a couple of times.

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