Re: [PATCH] ALSA: hda/hdmi: Use only dynamic PCM device allocation #forregzbot

[Thorsten Leemhuis <regressions@leemhuis.info>]

[Note: this mail contains only information for Linux kernel regression
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On 25.12.22 13:14, Michael Laß wrote:
> CC'ing amd-gfx as this might be an issue in the amd driver.
> 
> This change causes a regression in Linux 6.1 at least on some AMD APUs.
> There are reports from users with Ryzen 4750U, 5800U and 5850U chips
> where the HDMI sound devices don't show up anymore. I'm affected by
> this as well.
> 
> Reverting this commit (ef6f5494) makes the HDMI audio devices show up
> again. I verified that this is still an issue in current Linux git
> (72a85e2b).

Thanks for the report. To be sure below issue doesn't fall through the
cracks unnoticed, I'm adding it to regzbot, my Linux kernel regression
tracking bot:

#regzbot ^introduced ef6f5494faf6a37c74990689a
#regzbot title alsa: hda/hdmi: HDMI sound devices don't show up anymore
with some AMD APUs
#regzbot ignore-activity

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)

P.S.: As the Linux kernel's regression tracker I deal with a lot of
reports and sometimes miss something important when writing mails like
this. If that's the case here, don't hesitate to tell me in a public
reply, it's in everyone's interest to set the public record straight.


> Am Donnerstag, dem 22.09.2022 um 10:40 +0200 schrieb Jaroslav Kysela:
>>> Per discussion on the alsa-devel mailing list [1], the legacy PIN to PCM
>>> device mapping is obsolete nowadays. The maximum number of the simultaneously
>>> usable PCM devices is equal to the HDMI codec converters.
>>>
>>> Remove the extra PCM devices (beyond the detected converters) and force
>>> the use of the dynamic PCM device allocation. The legacy code is removed.
>>>
>>> I believe that all HDMI codecs have the jack sensing feature. Move the check
>>> to the codec probe function and print a warning, if a codec without this
>>> feature is detected.
> 
> The corresponding message ("jack not detectable") is not shown on the
> affected system.
> 
>>> [1] https://lore.kernel.org/alsa-devel/2f37e0b2-1e82-8c0b-2bbd-1e5038d6ecc6@perex.cz/
> 
> Links to some reports of this issue:
> https://bugzilla.kernel.org/show_bug.cgi?id=216836
> https://bbs.archlinux.org/viewtopic.php?pid=2075700
> https://bugs.archlinux.org/task/76917
> https://www.reddit.com/r/archlinux/comments/zsqq7i/hdmi_audio_is_broken_after_updating_kernel_to_611
> 
> Best regards,
> Michael