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Date: Sat, 04 Apr 2015 14:37:21 +0200
Message-ID: <s5hpp7kxe66.wl-tiwai@suse.de>
From: Takashi Iwai <tiwai@suse.de>
To: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>
Cc: Jaroslav Kysela <perex@perex.cz>, alsa-devel@alsa-project.org,
        linux-kernel@vger.kernel.org
Subject: Re: linux-next - strange audio bug
In-Reply-To: <57781.1428021275@turing-police.cc.vt.edu>
References: <57781.1428021275@turing-police.cc.vt.edu>
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At Thu, 02 Apr 2015 20:34:35 -0400,
Valdis Kletnieks wrote:
> 
> Next-20150310 works OK, next-20150324 has the bug.
> 
> Dell Latitude E6530 laptop, lspci tells me:
> 
> 01:00.1 Audio device: NVIDIA Corporation GF108 High Definition Audio Controller (rev a1)
>         Subsystem: Dell Device 0535
>         ...
>         Kernel driver in use: snd_hda_intel
> 
> Symptoms:  Audio works perfectly at boot, and for some amount
> of time after.  But somewhere around 6-8 hours of uptime, it gets
> into a strange state where I'll get no audio... and then it will
> cut in for all of 2 seconds or so (fairly consistent, that part),
> and then cut back out for anywhere from 10 seconds to a minute,
> then another 2 seconds of sound.. lather rinse repeat.
> 
> Before I start the thankless task of bisecting this (which means I'll
> be able to do only 1, *maybe* 2 steps a day), does this ring any bells?

Try for-next branch of sound git tree
   git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git

Now I merged fixes that might be relevant with the runtime PM on some
codecs, so it might work better.

In anyway, please give alsa-info.sh outputs at good and bad-working
states.


thanks,

Takashi