RE: Fwd: [Bug 217440] New: ALC236 audio disappears from HP 15z-fc000 on warm boot

[Kailang <kailang@realtek.com>]

Hi Joseph,

echo 0 > /sys/module/snd_hda_intel/parameters/power_save

Could you give it a try? Then got dump also.

If it passed, please test my two patches also. Then get dump again. 

This was AMD chipset. I hadn't seen this issue on INTEL platform.

Thanks.

> -----Original Message-----
> From: Takashi Iwai <tiwai@suse.de>
> Sent: Friday, June 9, 2023 2:56 PM
> To: Kailang <kailang@realtek.com>
> Cc: Joseph C. Sible <josephcsible@gmail.com>; Bagas Sanjaya
> <bagasdotme@gmail.com>; regressions@lists.linux.dev; perex@perex.cz;
> tiwai@suse.com; alsa-devel@alsa-project.org
> Subject: Re: Fwd: [Bug 217440] New: ALC236 audio disappears from HP
> 15z-fc000 on warm boot
> 
> 
> External mail.
> 
> 
> 
> On Fri, 09 Jun 2023 05:04:29 +0200,
> Kailang wrote:
> >
> > Hi Takashi,
> >
> > ALC236 works normally.
> > But codec register can't show it. (it shows "Invalid AFG subtree")
> > Could you know why?
> 
> It's the call of snd_hda_get_subnodes(), i.e. snd_hdac_get_subnodes(), which
> simply reads the raw parameter value (uncached)
> AC_PAR_NODE_COUNT:
> 
> int snd_hdac_get_sub_nodes(struct hdac_device *codec, hda_nid_t nid,
>                            hda_nid_t *start_id) {
>         unsigned int parm;
> 
>         parm = snd_hdac_read_parm_uncached(codec, nid,
> AC_PAR_NODE_COUNT);
>         if (parm == -1) {
>                 *start_id = 0;
>                 return 0;
>         }
>         *start_id = (parm >> 16) & 0x7fff;
>         return (int)(parm & 0x7fff);
> }
> 
> So it means the read of this parameter failed.
> 
> I suppose this is under the power-save, and it might be some timing issue?
> What if you disable the codec power saving?  The easiest way would be to
> pass
>   echo 0 > /sys/module/snd_hda_intel/parameters/power_save
> 
> 
> thanks,
> 
> Takashi
> 
> >
> > BR,
> > Kailang
> > > -----Original Message-----
> > > From: Joseph C. Sible <josephcsible@gmail.com>
> > > Sent: Thursday, June 8, 2023 10:43 PM
> > > To: Kailang <kailang@realtek.com>
> > > Cc: Takashi Iwai <tiwai@suse.de>; Bagas Sanjaya
> > > <bagasdotme@gmail.com>; regressions@lists.linux.dev; perex@perex.cz;
> > > tiwai@suse.com; alsa-devel@alsa-project.org
> > > Subject: Re: Fwd: [Bug 217440] New: ALC236 audio disappears from HP
> > > 15z-fc000 on warm boot
> > >
> > >
> > > External mail.
> > >
> > >
> > >
> > > On Thu, Jun 8, 2023 at 2:32 AM Kailang <kailang@realtek.com> wrote:
> > > >
> > > > Could you use your patch to dump codec info again?
> > > > I want to check it will also show "invalid AFG subtree".
> > >
> > > Okay, here's the same command's output again, this time from under
> > > the kernel with my patch that does fix the problem. It does also
> > > show "invalid AFG subtree".
> > >
> > > Thanks,
> > >
> > > Joseph C. Sible
> > >
> > > ------Please consider the environment before printing this e-mail.