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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.


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