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

9 Jun 2023


      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
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