This bug was fixed in the package pulseaudio - 1:13.99.1-1ubuntu3.11
---------------
pulseaudio (1:13.99.1-1ubuntu3.11) focal; urgency=medium
* d/p/0016-check_off_profile_when_switching_profile.patch
* d/p/0017-add_dynamic_priority_bonus_base_for_alsa_profiles.patch
Fix a "Rear Mic" always showing on input list when using dual codec.
(LP: #1929371)
[ Hui Wang ]
* d/p/0704-alsa-mixer-use-safe-dB-range-values-when-the-overrid.patch
* d/p/0705-alsa-mixer-add-support-up-8-mixer-channels.patch
- The linux kernel 5.11 starts supporting more than 2 channels for
the digital mic, we need to add the support of 8 channels for a
single alsa mixer, otherwise the PA can't change the hardware input
volume of the digital mic.
(LP: #1929817)
-- Jeremy Szu <jeremy....@canonical.com> Tue, 25 May 2021 16:04:07
+0000
** Changed in: pulseaudio (Ubuntu Focal)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1929817
Title:
[SRU] pulseaudio: let a single alsa mixer support up to 8 channels
(focal only)
Status in pulseaudio package in Ubuntu:
Fix Released
Status in pulseaudio source package in Focal:
Fix Released
Bug description:
[Impact]
Many Lenovo laptops have up to 4 microphones (microphone array), before the
linux kernel 5.11, the alsa mixer for digital microphone is 2 channels, and the
PA in the focal also supports up to 2 chanels for a single alsa mixer, so the
PA in the focal works well with linux kernel 5.10 and lower on those Lenovo
laptops. But we are going to install hirsute kernel (5.11) to the focal, the PA
in the focal can't handle 4 channels of the digital mic, it will use pure
software volume for digital mic, user can't adjust hardware volume of the
digital mic anymore.
[Fix]
Backport 2 patches from PA-14.2, the PA in the hirsute (21.04) already have
these 2 patches, so this SRU is for focal only. After applying these 2 patches,
the PA could handle up to 8 channels for a single alsa mixer.
[Test]
Install patched PA on Lenovo laptops with 4 digital microphone, I could
change the hardware input volume of digital mic through pulseaudio. I also
installed patched PA to some old lenovo and Dell machines, all output and input
devices worked as well as before, there is no regression observed.
[Where problems could occur]
This could introduce a regression on the output/input volume control, for
example, the output or input volume only supports software volume in the PA,
users can't adjust the hardware volume through pulseaudio anymore. But this
regression possibility is very low, first the hirsute already has these 2
patches, second I already tested these 2 patches on different machines, all
worked as well as before.
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