To remove sound during current boot:
modprobe -r pcspkr
To remove sound for subsequent reboots:
vi /etc/modprobe.d/blacklist
Add:
# remove speaker beep on subsequent reboots
blacklist pcspkr
To remove sound during current boot:
modprobe -r pcspkr
To remove sound for subsequent reboots:
vi /etc/modprobe.d/blacklist
Add:
# remove speaker beep on subsequent reboots
blacklist pcspkr
Courtesy of Yellow Bricks: