Public bug reported:
The file /var/lib/alsa/asound.state has the following part for the
settings for the Logitech Q9000 camera.
control.3 { iface MIXER name 'Mic Capture Volume' value 0 comment {
access 'read write' type INTEGER count 1 range '0 - 3072' dbmin 1800
dbmax 3000 dbvalue.0 1800 } }
The dbmin value of 1800 (18db) is too high and causes the mic signal to
be distorted. The value should probably be 0 and the default value
(dbvalue.0 1800) should also probably be set to 0 (0db) and not 1800
(18 db.)
With the dbmin of 1800, it is impossible to set this any lower than 18db
in alsamixer.
In my system, this value comes from /proc/asound/card1/usbmixer and is
linked to /proc/asound/Q9000/usbmixer.
I've tested this out by editing /var/lib/alsa/asound.state to set dbmin
and dbvalue.0 to 0 and the sound on the microphone stops being
distorted.
Description: Ubuntu 21.04
Release: 21.04
I have not idea what the package is, but I listed the files so hopefully
that is good enough.
What I expect to happen:
To have the default value for the mic gain to not default so high as to cause
distortion and the the value to be able to be set to 0db (or less even?) in
alsamixer.
What mappened instead?
The mic distorts because the lowest available gain is 18db. You can't set this
below 18db in alsa mixer. This happens in any program that uses the mic input.
** Affects: kubuntu-settings (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1946529
Title:
Logitech Q9000 default mic gain too high, causes distortion
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