linux-kernel - Re: 3.19 on Nokia n900: audio quality awful

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Message-ID: <20150106203918.GI30544@fuloong-minipc.musicnaut.iki.fi>
Date:	Tue, 6 Jan 2015 22:39:18 +0200
From:	Aaro Koskinen <aaro.koskinen@....fi>
To:	Pavel Machek <pavel@....cz>
Cc:	Felipe Balbi <balbi@...com>, pali.rohar@...il.com, sre@...ian.org,
	sre@...g0.de, kernel list <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
	ivo.g.dimitrov.75@...il.com
Subject: Re: 3.19 on Nokia n900: audio quality awful

Hi,

On Tue, Jan 06, 2015 at 06:51:15PM +0100, Pavel Machek wrote:
> On Tue 2015-01-06 11:25:45, Felipe Balbi wrote:
> > On Tue, Jan 06, 2015 at 06:04:33PM +0100, Pavel Machek wrote:
> > > In 3.18, sound is nice and clear.
> > > 
> > > In 3.19, sound is unusable. It produces nasty tone when it should be
> > > quiet, and there's at least as much noise as is sound.
> > > 
> > > Unfortunately, list of mixers also changed (and there's cca 120
> > > settings), but a) it does not work with the old list and b) nothing I
> > > could figure out did make the sound usable. Some setting resulted in
> > > even more noise.
> > > 
> > > Any idea what could have caused it?
> > 
> > $ git bisect start
> > $ git bisect good v3.18
> > $ git bisect bad
> > 
> > that'll help find what caused it.
> 
> Telling someone to do hard and time consuming job that probably will
> not succeed, instead of actually providing help. Very very funny.

No, that was actually really a good advice. You should try to bisect it.
It doesn't take that long (I assume you are cross-compiling instead
of doing native builds), also Linux maintainers are generally doing
a very good job ensuring the tree is bisectable.

I would do it myself, but so far I never have set up my N900 to play
any audio and I don't have any reference points between "good" or "bad".

A.
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