On ubuntu 19.04 after an update sound stopped. I've tried modprobe remedies redoing the downgrading/upgrading the OS back to 18.04. Everything comes up dummy output in the sound settings. Aplay reports:
aplay: device_list:270: no soundcards found...
lspci says:
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21) (prog-if 80)
Subsystem: Hewlett-Packard Company Sunrise Point-LP HD Audio
Flags: bus master, fast devsel, latency 32, IRQ 130
Memory at b12b0000 (64-bit, non-prefetchable) [size=16K]
Memory at b1290000 (64-bit, non-prefetchable) [size=64K]
Capabilities: [50] Power Management version 3
Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel, snd_soc_skl
alsamixer complains:
cannot open mixer: No such file or directory
lsmod | grep snd returns:
snd_soc_skl 86016 0
snd_soc_skl_ipc 65536 1 snd_soc_skl
snd_hda_ext_core 24576 1 snd_soc_skl
snd_soc_sst_dsp 32768 1 snd_soc_skl_ipc
snd_soc_sst_ipc 16384 1 snd_soc_skl_ipc
snd_soc_acpi 16384 1 snd_soc_skl
snd_soc_core 241664 1 snd_soc_skl
snd_compress 20480 1 snd_soc_core
ac97_bus 16384 1 snd_soc_core
snd_pcm_dmaengine 16384 1 snd_soc_core
snd_hda_intel 45056 0
snd_hda_codec 126976 1 snd_hda_intel
snd_hda_core 81920 4 snd_hda_intel,snd_hda_ext_core,snd_hda_codec,snd_soc_skl
snd_hwdep 20480 1 snd_hda_codec
snd_pcm 98304 7 snd_hda_intel,snd_hda_ext_core,snd_hda_codec,snd_soc_core,snd_soc_skl,snd_hda_core,snd_pcm_dmaengine
snd_seq_midi 16384 0
snd_seq_midi_event 16384 1 snd_seq_midi
snd_rawmidi 32768 1 snd_seq_midi
snd_seq 65536 2 snd_seq_midi,snd_seq_midi_event
snd_seq_device 16384 3 snd_seq,snd_seq_midi,snd_rawmidi
snd_timer 32768 2 snd_seq,snd_pcm
snd 81920 10 snd_seq,snd_seq_device,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_timer,snd_compress,snd_soc_core,snd_pcm,snd_rawmidi
soundcore 16384 1 snd
The only advice online I haven't followed so far is looking in my bios because when I boot into the bios there are no options I can see and access that effect the hardware.
Here are some links I found that didn't work for me.
https://www.linuxuprising.com/2018/06/fix-no-sound-dummy-output-issue-in.html
https://docs.slackware.com/howtos:hardware:audio_and_snd-hda-intel#how_to_find_the_right_options
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