[pulseaudio-tickets] [Bug 87202] Strong noise (unintelligible) when playing through the analog output using mmap

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87202

--- Comment #5 from Mario Sanchez Prada <msanchez at gnome.org> ---
Created attachment 110736
  --> https://bugs.freedesktop.org/attachment.cgi?id=110736&action=edit
Output of dmesg when loading the snd-hda-intel module

(In reply to David Henningsson from comment #3)
> I still have the feeling this is kernel/driver/hw related. At least we have
> this message in the log:
> 
> [  327.857108] hda-intel 0000:00:1b.0: Unstable LPIB (17628 >= 4408);
> disabling LPIB delay counting
> 
> Could you tell if this is related to when the error happens for the first
> time?

I can't really tell, as I could not see anymore that message in the output of
dmesg after trying this morning (even if I managed to reproduce the noise
again).

The only output I can see in dmesg happens at the time of loading the
snd-hda-intel module, which I'm attaching right now.

> Also, when this error is happening, do you have *constant* entries in the
> debug log about rewinds? It's natural to have them when you change volume,
> but not for them to persist after the volume change is completed.

No constant entries, only when changing the volume or when switching between
output devices (headphones <-> HDMI).

By the way, sometimes it's harder than other times for me to get the noise by
simply modifying the volume (although I eventually get the noise anyway), but
when that happens just switching to HDMI and then back to headphones usually
makes me get the noise easily (after no more than 1-3 attempts, normally).

Not sure how relevant this is to the discussion, but I thought I would mention
it because I saw rewinds are also involved when switching between outputs.

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