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

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Date:	Sat, 12 Jan 2013 11:40:24 -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:

> At Sat, 22 Dec 2012 14:23:24 -0700,
> Kevin Fenzi wrote:
> > 
> > Greetings. 
> > 
> > I've got an issue with sound on my t510. It started in the late
> > 3.4.x kernels. Sound works on boot and for 5-10min after, then the
> > speakers stop working at all. 
> > 
> > I posted a while back on the alsa-users list, and someone else had
> > the same issue: 
> > 
> > http://www.mail-archive.com/alsa-user@lists.sourceforge.net/msg28769.html
> > 
> > It seems that the speakers(?) are getting moved to state D3 and
> > turning off. You can manually get it to come back for a few minutes
> > by using hda-verb to move it back to D0: 
> > 
> > hda-verb /dev/snd/hwC0D0 0x1f SET_POWER_STATE 0
> > 
> > http://www.alsa-project.org/db/?f=fd5ca157b2e76942df5ce2f0ae1a2817f3f08afd
> > is my alsa-info. 
> > 
> > I'd file a bug on the alsa bug tracker, but it still seems to be
> > down (for many months now?). No response on alsa-users, so now that
> > I have a bit of time, I am posting here in hopes someone can
> > look. ;) 
> > 
> > Happy to provide more info or try things. 
> 
> 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.
> 
> 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.

ok. I am not sure I am doing the right thing, but: 

- echo 1 > /sys/kernel/debug/tracing/events/hda/enable
- Run hda-verb to get sound working. 
- Play a video to confirm. 
- check /sys/kernel/debug/tracing/trace
- Wait a while. 
- Play another sound that doesn't come out of speakers. 
- check /sys/kernel/debug/tracing/trace for anything new. 

The only things I see in the trace file are my hda-verb call, and the
sounds playing. Nothing else. 

I then tried to duplicate it, but the trace file didn't seem to update
properly. Is there some reset needed? 

Or is this not the info you were looking for?

        hda-verb-27187 [001] .... 78907.305149: hda_power_count: [0:0]
        power_count=1, power_on=1, power_transition=0
        hda-verb-27187 [001] .... 78907.305152: hda_send_cmd: [0:0]
        val=1f70500
        hda-verb-27187 [001] .... 78907.305214: hda_get_response: [0:0]
        val=0
        hda-verb-27187 [001] .... 78907.305214: hda_power_count: [0:0]
        power_count=0, power_on=1, power_transition=0
       alsa-sink-17958 [000] .... 78933.682478: hda_power_count: [0:0]
        power_count=1, power_on=1, power_transition=0
       alsa-sink-17958 [000] .... 78933.683330: hda_power_count: [0:0]
        power_count=2, power_on=1, power_transition=0
       alsa-sink-17958 [000] .... 78933.683335: hda_power_count: [0:0]
        power_count=3, power_on=1, power_transition=0
       alsa-sink-17958 [000] .... 78933.683336: hda_send_cmd: [0:0]
        val=103a047
       alsa-sink-17958 [000] .... 78933.683378: hda_get_response: [0:0]
        val=0
       alsa-sink-17958 [000] .... 78933.683379: hda_power_count: [0:0]
        power_count=2, power_on=1, power_transition=0
       alsa-sink-17958 [000] .... 78933.683380: hda_power_count: [0:0]
       power_count=3, power_on=1, power_transition=0
...

kevin

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