It seems that Blender 2.82.7 can not use my sound sub-system, only in exclusive mode. If browser is running, Blender cannot play sound in VSE. If I close the browser, re-run Blender (or choose same audio device in settings) sound is on.
But if I run browser again, it cannot play videos until I close Blender. Error message is:
ALSA lib pcm_dmix.c:1089:(snd_pcm_dmix_open) unable to open slave AL lib: (EE) ALCplaybackAlsa_open: Could not open playback device 'default': Device or resource busy
Note: I tried all audio devices in Blender. Just downloaded Blender 2.79b - it works fine.
Upd1.
Added "options snd_hda_intel index=1" to /etc/modprobe.d/default.conf
Now I see:
ALSA lib confmisc.c:767:(parse_card) cannot find card '0' ALSA lib conf.c:4693:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory ALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings ALSA lib conf.c:4693:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory ALSA lib confmisc.c:1246:(snd_func_refer) error evaluating name ALSA lib conf.c:4693:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory ALSA lib conf.c:5181:(snd_config_expand) Evaluate error: No such file or directory ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM default AL lib: (EE) ALCplaybackAlsa_open: Could not open playback device 'default': No such file or directory
Upd2.
This is known bug of snap version. Version downloaded from official site works.
Link to bug - https://developer.blender.org/T72920
