After updating to Xubuntu 18 the system started playing sounds when, for example, I cancel a command in Emacs, or the search in HTML page displayed in Firefox fails. This is very inconvenient because this happens a lot and the sound played is very loud.
I don't know what produces this sound. Kernel module
pcspkr is not loaded. I tried
xset -b xset b off
Which also had no effect.
This is not a problem specific to console, however, console applications also play sounds.
When I tried set zeroth channel of alsa mixer to mute:
amixer set channel 0% mute amixer: Unable to find simple control 'channel',0
But when I look at the output of
Simple mixer control 'Beep',0 Capabilities: pvolume pswitch Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Mono: Front Left: Playback 0 [0%] [-34.50dB] [off] Front Right: Playback 0 [0%] [-34.50dB] [off]
I looked at
Settings > Appearance > Enable Sound Events, but it's not ticked...
Short of opening the case and cutting off the beeper, I don't know what else to try. Any ideas?