linux-kernel - [REGRESSION] "ALSA: HDA: Early Forbid of runtime PM" broke my laptop's internal audio

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Message-Id: <EM1ONQ.OL5CFJTBEBBW@redhat.com>
Date:   Thu, 28 Jan 2021 16:39:50 -0600
From:   Michael Catanzaro <mcatanzaro@...hat.com>
To:     alsa-devel@...a-project.org, Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Harsha Priya <harshapriya.n@...el.com>
Cc:     linux-kernel@...r.kernel.org
Subject: [REGRESSION] "ALSA: HDA: Early Forbid of runtime PM" broke my
 laptop's internal audio

Hi,

On my System76 Gazelle Pro (gazp9) laptop, internal audio broke after 
upgrading to kernel 5.10.

The laptop's speakers produce no sound. Audio from headphones still 
works fine. A quick test is to visit GNOME System Settings -> Sound -> 
Output, select Test, click Front Left or Front Right and notice there 
is no sound. I tested a mainline kernel revision from yesterday 
(5.11-rc5+) and the regression is not yet fixed. I bisected the 
regression to "ALSA: HDA: Early Forbid of runtime PM":

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a0645daf16101bb9a6d87598c17e9a8b7bd60ea7

I created a downstream bug report here, including some bits from dmesg 
that may or may not be relevant in comment #2:

https://bugzilla.redhat.com/show_bug.cgi?id=1918933

Audio devices:

$ lspci | grep -i audio
00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core 
Processor HD Audio Controller (rev 06)
00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset 
High Definition Audio Controller (rev 05)

OS: Fedora 33

I'm happy to provide any additional required info or test patches if 
you CC me, since I'm not a kernel developer and am not subscribed to 
these lists. Thanks.