** Changed in: alsa-ucm-conf (Ubuntu Impish)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1940788
Title:
[SRU] the input volume of external mic for sof driver is 0 by default
Status in HWE Next:
New
Status in alsa-ucm-conf package in Ubuntu:
Fix Committed
Status in alsa-ucm-conf source package in Focal:
In Progress
Status in alsa-ucm-conf source package in Hirsute:
Fix Committed
Status in alsa-ucm-conf source package in Impish:
Fix Committed
Bug description:
The change of this SRU has been squashed to
https://bugs.launchpad.net/ubuntu/+source/alsa-ucm-conf/+bug/1937980.
[Impact]
For the machines with sof audio driver, after we freshly install the ubuntu
linux and plug a microphone or headset-mic to the audio jack, we can't record
sound through them since the default input volume is 0, users need to adjust
the input volume to non-zero manually, then could record sound successfully.
[Fix]
Backport 1 patch (https://github.com/alsa-project/alsa-ucm-conf/pull/107),
after applying the patch, the ucm will set the 'Capture Switch' to on in the
bootsequence, and set the Capture volume to 60%, then users could record sound
without manually adjust the input volume.
[Test]
sudo rm /var/lib/alsa/*; rm ~/.config/pulse/*; alsactl init; reboot, plug a
headset to the audio jack, use the headset-mic to record the sound, it could
record successfully.
[Where problems will occur]
This SRU changes the Capture Switch and Capture Volume in the ucm, this could
make the whole ucm can't be parsed if the syntax is not correct, then the whole
audio will fail to work like audio jack can't detect plugin/plugout and the
internal mic can't be found. But this regression possibility is very low since
we already tested the change on lenovo and Dell machines, all worked well.
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