[pulseaudio-discuss] [PATCH] alsa: reset watermark to initial values on resume

[Arun Raghavan]

On Fri, 2011-10-07 at 18:12 -0500, Pierre-Louis Bossart wrote:
> Watermark level and latency values are not restored when
> resuming, the values used prior to suspending are reused.
> This leads to side effects when underruns happen and buffer
> sizes are updated, PulseAudio can never meet lower latency
> requirements.
> 
> Solution: keep track of watermark and latency values on sink or
> source creation, and reapply them on resume to start with
> a clean slate.

One possible concern here -- if the default values are too low for a
system, every suspend-unsuspend cycle will force readjustment,
potentially causing artefacts.

I'd argue that it's better to adjust the defaults on such a system,
though, and broadly take the optimistic view that any major
readjustments are unlikely to be required permanently.

This is in my tree now -- just pointing out one side effect in case
anyone else has similar concerns.

-- Arun