linux-kernel - Re: ALSA: Conexant CX20585 (thinkpad t510) speaker powersave regression

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Message-ID: <20130109165807.11a07af0@jelerak.scrye.com>
Date:	Wed, 9 Jan 2013 16:58:07 -0700
From:	Kevin Fenzi <kevin@...ye.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: ALSA: Conexant CX20585 (thinkpad t510) speaker powersave
 regression

On Tue, 08 Jan 2013 16:26:38 +0100
Takashi Iwai <tiwai@...e.de> wrote:

> It's a known problem that some people have already reported, but
> currently no clue who actually turns down the pin to D3.
> Conexant guys wrote me that the codec doesn't do it by itself, and the
> driver neither, AFAIK.  A possible answer is the firmware / BIOS, but
> who knows.

Thanks for the answer! :) 

> In anyway, could you try to trace the hd-audio events and see whether
> the power down is *not* issued by the driver when you see this state?
> See Documentation/sound/alsa/HD-Audio.txt, the section "Tracepoints"
> for a brief instruction.

I can give it a try... 

kevin

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