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

[Kevin Fenzi <kevin@scrye.com>]

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On Sun, 13 Jan 2013 10:06:41 +0100
Takashi Iwai <tiwai@suse.de> wrote:

> At Sat, 12 Jan 2013 11:40:24 -0700,
> Kevin Fenzi wrote:
> > 
> > On Tue, 08 Jan 2013 16:26:38 +0100
> > Takashi Iwai <tiwai@suse.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
> 
> Yes these are what I'd like to check.

Sorry for the long delay here... was the above info of any use? 

> The point to check here is exactly which verbs have been sent, and how
> is the codec power status.  Check what is the last power_on value when
> the problem appears.  If it's power_on=1, it's fine.
> And you can concentrate on the verb to NID 0x1f, namely, hda_send_cmd
> with a value 1fxxxxx.  In the example above, 1f70500 means it's
> setting the power state of 0x1f to D0.
> 
> Last but not least, you can try my very latest code in sound-unstable
> tree:
>   git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-unstable.git
> 
> Either master or test/hda-migrate branch contains the latest code for
> Conexant codecs.

I'll note that the problem persists in 3.9.0-0.rc1

Please let me know if there's anything I can do to move this along or
try. ;( 

kevin

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