Volume shows at 100%, nothing to select "multichannel".
jj@Jbox ~ $ inxi -Fxz
System: Host: Jbox Kernel: 4.13.0-32-generic x86_64 (64 bit gcc: 5.4.0)
Desktop: Cinnamon 3.6.7 (Gtk 3.18.9-1ubuntu3.3)
Distro: Linux Mint 18.3 Sylvia
Machine: System: Gigabyte product: AX370-Gaming K5 v: Default string
Mobo: Gigabyte model: AX370-Gaming K5-CF v: x.x
Bios: American Megatrends v: F3 date: 06/16/2017
CPU: Hexa core AMD Ryzen 5 1600 Six-Core (-HT-MCP-) cache: 3072 KB
flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm) bmips: 38398
clock speeds: max: 3200 MHz 1: 1550 MHz 2: 1550 MHz 3: 1550 MHz
4: 1550 MHz 5: 1550 MHz 6: 1550 MHz 7: 1550 MHz 8: 1550 MHz
9: 1550 MHz 10: 1550 MHz 11: 1550 MHz 12: 1550 MHz
Graphics: Card: Advanced Micro Devices [AMD/ATI] Device 67ef bus-ID: 09:00.0
Display Server: X.Org 1.18.4 drivers: ati,amdgpu (unloaded: fbdev,vesa,radeon)
Resolution:
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GLX Renderer: AMD POLARIS11 (DRM 3.18.0 / 4.13.0-32-generic, LLVM 5.0.0)
GLX Version: 3.0 Mesa 17.2.8 Direct Rendering: Yes
Audio: Card-1 Advanced Micro Devices [AMD] Device 1457
driver: snd_hda_intel bus-ID: 12:00.3
Card-2 Advanced Micro Devices [AMD/ATI] Device aae0
driver: snd_hda_intel bus-ID: 09:00.1
Sound: Advanced Linux Sound Architecture v: k4.13.0-32-generic
Network: Card: Intel I211 Gigabit Network Connection
driver: igb v: 5.4.0-k port: f000 bus-ID: 06:00.0
IF: enp6s0 state: up speed: 100 Mbps duplex: full mac: <filter>
Drives: HDD Total Size: 1000.2GB (1.6% used)
ID-1: /dev/sda model: ST1000DX002 size: 1000.2GB
Partition: ID-1: / size: 909G used: 7.2G (1%) fs: ext4 dev: /dev/sda1
ID-2: swap-1 size: 8.54GB used: 0.00GB (0%) fs: swap dev: /dev/sda5
RAID: No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors: System Temperatures: cpu: No active sensors found. Have you configured your sensors yet? mobo: N/A gpu: 35.0
Info: Processes: 266 Uptime: 29 min Memory: 1581.0/7988.6MB
Init: systemd runlevel: 5 Gcc sys: 5.4.0
Client: Shell (bash 4.3.481) inxi: 2.2.35
There is a chance the onboard audio chip Realtek ACL1220 may have issues with the kernel. It's also been suggested to me to update the BIOS, but have never heard of such a thing until now.
(I removed 4.15 since last post).