Disable ATI HDMI sound device – Fedora with PulseAudio

VMG's answer is subtly wrong; it will technically work, but it will disable all other plugins than a2dp, meaning bluetooth keyboards/mice/gamepads/etc will stop working, when the only plugin causing issues seems to be one called avrcp.

Edit

/lib/systemd/system/bluetooth.service

and change

ExecStart=/usr/lib/bluetooth/bluetoothd

to

ExecStart=/usr/lib/bluetooth/bluetoothd --noplugin=avrcp

and run

sudo systemctl daemon-reload
sudo systemctl restart bluetooth

I ended up here because of the very same problem, after upgrading from Stretch, the audio disappeared. Similar symptoms and outputs (Nvidia card and Intel HDA sound). While following instructions, though, I've found that I couldn't get this step to work:

root@desk:~# aplay -D plughw:0,0 /usr/share/sounds/alsa/Front_Center.wav
aplay: main:828: audio open error: Device or resource busy

I found that the culprit was timidity:

root@desk:~# fuser -v /dev/snd/*
                     USER        PID ACCESS COMMAND
/dev/snd/pcmC0D0p:   timidity   1274 F...m timidity
/dev/snd/seq:        timidity   1274 F.... timidity

Once I killed it, I could proceed editing /etc/pulse/default.pa and everything snapped into place. I'm still not sure if the issue was the missing PA sink or timidity taking over.

I've also considered filing a bug report, but I'm not sure where would be more appropriate. If you have any suggestions, I'll be happy to follow your lead and add my support to the report.

Thank you for sharing the solution!