[SRU][OEM-5.6][PATCH 0/2] alsa: the output volume can't be adjusted on the Lenovo machines with Bass speaker

Hui Wang hui.wang at canonical.com
Fri Jun 11 01:28:31 UTC 2021

BugLink: https://bugs.launchpad.net/bugs/1931649

These 2 patches are already in the ubuntu 5.8.0-generic and later
version kernels, but they are not in the oem-5.6 oem kernel yet.

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 (1):
  ALSA: hda/realtek: make bass spk volume adjustable on a yoga laptop

Takashi Iwai (1):
  ALSA: hda/realtek - Improved routing for Thinkpad X1 7th/8th Gen

 sound/pci/hda/patch_realtek.c | 49 ++++++++++++++++++++++++++++++++++-
 1 file changed, 48 insertions(+), 1 deletion(-)


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