How To Disable HDMI Audio Output in Linux
This solution works to remove HDMI audio output but it does so together with HDA audio output also. It might work if you have some other, non-HDA sound card (such as an external USB device).
This SO post offers the following:
This does not do anything on my system, the
is loaded anyway (perhaps as a dependency).
Force the module to really not load - add to
blacklist sndhdacodechdmi install sndhdacodechdmi /bin/false
This did in fact stop
snd_hda_codec_hdmi from loading, however the
HDMI audio device remained with a generic driver:
% aplay -l **** List of PLAYBACK Hardware Devices **** card 0: HDMI [HDA ATI HDMI], device 3: Generic Digital [Generic Digital] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: Generic [HD-Audio Generic], device 0: ALC221 Analog [ALC221 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0
Disable the generic codec as well:
blacklist sndhdacodechdmi install sndhdacodechdmi /bin/false blacklist sndhdacodecgeneric install sndhdacodecgeneric /bin/false
This unfortunately caused all audio devices to disappear, including the analog audio output.
This option didn't have any effect on my system (HP t620 thin client). From this SO post:
radeon.audio=0 to the kernel boot command, e.g. in
kernel /vmlinuz-linux root=/dev/sda6 ro radeon.audio=0
On Debian, edit
/etc/default/grub and add
radeon.audio=0 to the line
GRUB_CMDLINE_LINUX=, e.g. in my case
GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0 radeon.audio=0"