When I open sound settings, No profile options are listed for "Built-in audio" except for "Off".
Machine is a Acer Chromebook Spin 713 with MrChromeBox coreboot firmware and Ubuntu MATE 21.04 installed (however, issue also exists with Lubuntu 20.04.3). Laptop has built-in speakers and a 3.5mm audio jack, but does not recognize any playback audio devices except HDMI.
Sound Device:
00:1f.3 Multimedia audio controller: Intel Corporation Comet Lake PCH-LP cAVS
DeviceName: Multimedia audio controller
Subsystem: Intel Corporation Comet Lake PCH-LP cAVS
Flags: bus master, fast devsel, latency 64, IRQ 148
Memory at 9fa14000 (64-bit, non-prefetchable) [size=16K]
Memory at 9f900000 (64-bit, non-prefetchable) [size=1M]
Capabilities:
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel, snd_sof_pci
alsa-info output:
http://alsa-project.org/db/?f=7d8c2e0f06a902f817c71fdf4aae1f16e7b21227
Note: I have made one modification to /etc/modprobe.d/alsa-base.conf, adding the following line:
"options snd-hda-intel dmic-detect=0"
Before this, the laptop's sound card was not being recognized at all.
alsa-info output from before:
http://alsa-project.org/db/?f=3c348ee95fa38bceb3f25e38e4de431766f808c8