$ git --no-pager log --pretty=oneline v4.19.48..v4.19.49 sound 3834630ef4d33f2a372e01dadeb6980761259a90 ALSA: hda/realtek - Improve the headset mic for Acer Aspire laptops
9cfd6c36759b1e54c2bbf36f1d03b4e1bbc61d7e ALSA: hda/realtek - Set default power save node to 0
eb2eeec920fb1b9b6faf8ea340f6295a2d03602b ALSA: line6: Assure canceling delayed work at disconnection
So apparently it's "ALSA: hda/realtek - Set default power save node to 0"
$ git --no-pager log --pretty=oneline v4.19.48..v4.19.49 sound 3834630ef4d33f2 a372e01dadeb698 0761259a90 ALSA: hda/realtek - Improve the headset mic for Acer Aspire laptops 4c2bbf36f1d03b4 e1bbc61d7e ALSA: hda/realtek - Set default power save node to 0 b6faf8ea340f629 5a2d03602b ALSA: line6: Assure canceling delayed work at disconnection
9cfd6c36759b1e5
eb2eeec920fb1b9
So apparently it's "ALSA: hda/realtek - Set default power save node to 0"
I'll send the fix patch soon.