alsa: the output volume can't be adjusted on the Lenovo machines with Bass speaker

Bug #1931649 reported by Hui Wang
This bug affects 1 person
Affects Status Importance Assigned to Milestone
HWE Next
linux-oem-5.6 (Ubuntu)
Hui Wang

Bug Description

Users could adjust the speaker's output volume from UI, but the sound
doesn't change with the user's adjustment.

Backport 2 upstream patches, these patches are merged to 5.8.0-generic
with stable update, but not in 5.6-oem yet.

run amixer contents | grep DAC1, we could see the DAC1 mixer control
is found, adjust the speaker's volume from gnome-sound-setting, then
play some sound, we could hear the sound's volume is changed with our

[Where problems could occur]
This could possibly introduce the speaker output doesn't work anymore
on lenovo machines with dual speakers, but this posibility is very low,
I have tested the patches on 3 different lenovo machines with dual

Hui Wang (
affects: linux (Ubuntu) → linux-oem-5.6 (Ubuntu)
Changed in linux-oem-5.6 (Ubuntu):
importance: Undecided → High
status: New → Triaged
Changed in linux-oem-5.6 (Ubuntu Focal):
importance: Undecided → High
status: New → Triaged
tags: added: oem-priority originate-from-1931433 sutton
Hui Wang (
description: updated
Revision history for this message
Hui Wang ( wrote :

oem-5.6 kernel reaches eol, the fixing patches are already in the 5.8.0-generic, 5.10-oem and later version kernels.

set won't fix for oem-5.6 kernel.

Changed in linux-oem-5.6 (Ubuntu):
status: Triaged → Won't Fix
Changed in linux-oem-5.6 (Ubuntu Focal):
status: Triaged → Won't Fix
Changed in hwe-next:
status: New → Won't Fix
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