Here the same with a Thinkpad T570. The low sound appeared after
upgrading from 17.10 to 18.04 or 18.04.1.
$ cat /proc/asound/card*/codec* | grep Codec
Codec: Realtek ALC298
Codec: Intel Kabylake HDMI
$ sudo lspci -vvv | grep -A 40 -i audio
00:1f.3 Audio device: Intel Corporation Sunrise
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:Ubuntu 15.10
Release:15.10
Codename: wily
$ cat /proc/version
Linux version 3.19.0-30-generic (buildd@lcy01-14) (gcc version 4.9.2 (Ubuntu
4.9.2-10ubuntu13) ) #34-Ubuntu SMP Fri Oct 2 22:08:41 UTC
