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alsa - Why does aplay work when pulseaudio is running and ...
https://stackoverflow.com/questions/7183169/why-does-aplay-work-when-pulseaudio-is-running-and-else-not#:~:text=Using%20-D%20pulse%20should%20do%20the%20trick%20like%3A,should%20be%20able%20to%20find%20with%20aplay%20-L
alsa - Why does aplay work when pulseaudio is running …
https://stackoverflow.com/questions/7183169/why-does-aplay-work-when-pulseaudio-is-running-and-else-not
It states that alsa (aplay) is configured to send its output to pulseaudio (which is your sound server) by default. When your sound server is not running you will not be able to hear a sound as you have observed. See also "PulseAudio Removal"section to detach it from alsa. I hope this helps. Share Improve this answer answered Aug 25 '11 at 9:10
usb - aplay lists the device, but pulseaudio thinks it's ...
https://unix.stackexchange.com/questions/635813/aplay-lists-the-device-but-pulseaudio-thinks-its-locked-and-wont-detect-it
UPDATE 2021-07-08: I'm now using Pop!_OS 21.04 and this problem appears to have been resolved. I have just now tested with pulseaudio 14.2 and pipewire 0.3.24 and I was able to disconnect and reconnect a headset (connected by USB/stereo jack adapter) about 10 times in the span of one minute. No recurrence of the problem I describe below. I presume this …
PulseAudio/Examples - ArchWiki - Arch Linux
https://wiki.archlinux.org/title/PulseAudio/Examples
Restart PulseAudio, run pavucontrol and select the "Output Devices" tab. Three settings should be displayed: Internal Audio Digital Stereo (HDMI) Internal Audio Simultaneous output to Internal Audio Digital Stereo (HDMI), Internal Audio Now start a program that will use PulseAudio such as MPlayer, VLC, mpd, etc. and switch to the "Playback" tab.
pulseaudio - I can play audio with aplay but sound ...
https://askubuntu.com/questions/959849/i-can-play-audio-with-aplay-but-sound-settings-show-no-device
Applications such as the browser do not play audio to the speakers, but running aplay somefile does. When opening the sound settings menu a I see no audio devices. I also noticed that when that happens, pulseaudio isn't running. If I run it, I sometimes get a "Dummy Device" in the audio settings, but still no sound is playing.
gentoo alsa pulseaudio - alsa mixer works; aplay straight ...
https://unix.stackexchange.com/questions/357856/gentoo-alsa-pulseaudio-alsa-mixer-works-aplay-straight-to-hw1-0-works-aplay
If pulseaudio is running, the aplay fails silently. If pulseaudio is not running, it fails with an error 2, unable to open file. Most sound apps don't seem to allow low level specification of the sound hardware, so I can't get any sound at all except through aplay.
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