linux-kernel - Re: thinkpad x60: sound problems in 4.15-rc1 was Re: thinkpad x60: sound problems in 4.14.0-next-20171114

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Date:   Mon, 25 Dec 2017 11:09:00 +0100
From:   Pavel Machek <pavel@....cz>
To:     vcaputo@...garu.com
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Takashi Iwai <tiwai@...e.de>
Subject: Re: thinkpad x60: sound problems in 4.15-rc1 was Re: thinkpad x60:
 sound problems in 4.14.0-next-20171114

Hi!

> > > > > > > It happened first in -next, now it is in 4.15-rc1.
> > > > > > 
> > > > > > So you meant a possible regression between 4.14 and 4.15-rc1?
> > > > > 
> > > > > Yes.
> > > > 
> > > > Hm, as far as I see, the only significant difference is the commit
> > > > 20e3f985bb875fea4f86b04eba4b6cc29bfd6b71
> > > >     ALSA: pcm: update tstamp only if audio_tstamp changed
> > > >     
> > > > Another change d6c0615f510bc1ee26cfb2b9a3343ac99b9c46fb
> > > >     ALSA: hda - Fix yet remaining issue with vmaster 0dB
> > > >     initialization
> > > > is basically for fixing a previous wrong fix, and it should influence
> > > > on all use cases, not only for a specific application.
> > > 
> > > Happened again, this time on -rc3. It is more than "audio is silent"
> > > -- apps behave strangely. Let me test with
> > > 20e3f985bb875fea4f86b04eba4b6cc29bfd6b71 reverted.
> > > 
> > > Hmm. This is 4th regression this release cycle :-(.
> > 
> > 
> > Today I jumped to 4.15-rc4 from 4.14-rc6, and have noticed some oddities
> > with audio in youtube under firefox which I never experienced before.
> > 
> > If I pause the playback, the audio seems to infinitely loop on whatever
> > is in the dma buffer.  Resuming playback works but now the expected
> > audio has repeated pops and clicks mixed in with it.
> > 
> > Even closing firefox doesn't seem to stop the looping buffer...
> > 
> > Machine is an x61s 1.8ghz thinkpad, x86_64, debian stretch, .config attached.
> > 
> > This for me is a 4.15 blocker, and I presume it's related to Pavel's
> > experience as the x60 isn't much different AFAIK.
> > 
> 
> Just reproduced this, it seems to be trivial to repro and doesn't
> actually require pausing or anything.  Simply watching a youtube video
> causes the audio to get messed up after a short period.

Hmm. Yes, I do experience something similar, but that has been there
for long time now. Audio does not work with chromium (looping weirdly)
for first few minutes after boot. Then I restart chromium and it
starts to work ok... 

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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