linux-kernel - Re: [regression] Regular "cracks" in HDMI sound during playback since backport to 6.1.y for 92afcc310038 ("ALSA: hda: Conditionally use snooping for AMD HDMI")

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Message-ID: <87ed51ig23.wl-tiwai@suse.de>
Date: Mon, 30 Sep 2024 12:36:36 +0200
From: Takashi Iwai <tiwai@...e.de>
To: Salvatore Bonaccorso <carnil@...ian.org>
Cc: Takashi Iwai <tiwai@...e.de>,
	Jaroslav Kysela <perex@...ex.cz>,
	linux-sound@...r.kernel.org,
	Eric Degenetais <eric.4.debian@...batoulnz.fr>,
	linux-kernel@...r.kernel.org,
	stable <stable@...r.kernel.org>,
	regressions@...ts.linux.dev,
	Sasha Levin <sashal@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [regression] Regular "cracks" in HDMI sound during playback since backport to 6.1.y for 92afcc310038 ("ALSA: hda: Conditionally use snooping for AMD HDMI")

On Sat, 28 Sep 2024 15:19:49 +0200,
Salvatore Bonaccorso wrote:
> 
> Hi
> 
> In downstream Debian we got a report from  Eric Degenetais, in
> https://bugs.debian.org/1081833 that after the update to the 6.1.106
> based version, there were regular cracks in HDMI sound during
> playback.
> 
> Eric was able to bisec the issue down to
> 92afcc310038ebe5d66c689bb0bf418f5451201c in the v6.1.y series which
> got applied in 6.1.104.
> 
> Cf. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1081833#47
> 
> #regzbot introduced: 92afcc310038ebe5d66c689bb0bf418f5451201c
> #regzbot link: https://bugs.debian.org/1081833
> 
> It should be noted that Eric as well tried more recent stable series
> as well, in particular did test as well 6.10.6 based version back on
> 20th september, and the issue was reproducible there as well.
> 
> Is there anything else we can try to provide?

Could you check 6.12-rc1 kernel whether the problem still appears?
If yes, check with snd_hda_intel.snoop=0 boot option. 

I guess we should revert the patch in anyway; for 6.12, it's no longer
correct to check with get_dma_ops(), and if this causes a problem on
the older releases, the assumption isn't correct, either.


thanks,

Takashi