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Fresh install of Ubuntu 18.04. No audio input from onboard mic or headphone/mic combo (these both work fine when I boot same machine, Acer Swift 3 SF314-54, via Windows 10), alsamixer showing "sound device has no capture controls".

I don't know if it's related, but I installed "Pulse Audio Shortcuts" extension and when I try to turn it on in the extensions section of the GNOME Tweaks program I see a yellow warning triangle with "Error loading extension" next to it. I don't appear to have gstreamer-properties command, either, even though I believe PulseAudio comes with 18.04?

Anyways, would be very grateful for approaches to solve this, thanks!

Here's my input and output settings:

~$ arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC256 Analog [ALC256 Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 2: ALC256 Alt Analog [ALC256 Alt Analog]
Subdevices: 2/2
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1

~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC256 Analog [ALC256 Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 9: HDMI 3 [HDMI 3]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 10: HDMI 4 [HDMI 4]
Subdevices: 1/1
Subdevice #0: subdevice #0

ALSA settings screenshot

ALSA "no capture device setting" screenshot

Here's some related threads [1] [2] [3] [4]; I've tried basically all of the solutions suggested therein, except—as there were a number of different suggestions for how to modify /etc/modprobe.d/alsa-base.conf—I've only tried a couple of these but not all.

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