Update (2026): Fedora 18 đã hết hỗ trợ từ lâu. Các bản Fedora hiện đại dùng PipeWire thay cho PulseAudio; nếu mất âm thanh, thử systemctl --user restart pipewire pipewire-pulse wireplumber.

After installing Fedora 18 KDE and updating it, I got a sound problem and solved it with this workaround. Open a terminal and run:

# kill the running PulseAudio process
pulseaudio -k

# start it again; nohup keeps it running even if you close the terminal
nohup pulseaudio -vv > /dev/null 2>&1 &

I have no idea why a reboot didn't fix it (maybe PulseAudio was respawned in the same broken state after boot), but anyway it worked. Hope it helps :P