Volume feedback popping sound (the sound that should pop when increasing and decreasing the volume) doesn't work in Plasma 5.11.3 and 5.11.4 (new install of user edition). Also when going into System Settings -> Multimedia -> Audio -> Audio Hardware Setup, there is an option to test Front Left and Front Right speakers - that doesn't work either, though all is setup correctly, Pulse audio points to the correct hardware. I know it's correct because when I go to the other tab called Device preference, click there on the only existing device and hit Test, the sound works.

OK got more info about the problem. When I run the system settings from terminal and try to test the speakers, I get the following error:

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ALSA lib pcm.c:2266:(snd_pcm_open_noupdate) Unknown PCM 0

If I try to increase or decrease the volume using the volume widget I get the following message:

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Got info about sink "Built-in Audio Analog Stereo"
"Want ID: No; Have ID: No"

OK the answer is this bug:

https://bugs.kde.org/show_bug.cgi?id=381894