Sound through HDMI does not work under pipeware on Fedora 35

Question

I recently installed Fedora 35. I used an HDMI cable to use a TV as a second screen. I am able to use the video, but the audio does not work on the screen when using this computer.

Fedora 35 currently uses pipeware + wireplumber by default, as described at https://fedoraproject.org/wiki/Changes/WirePlumber

I already tried to switch to pipewire-media-session as described above, but it did not work.

The sound through HDMI works: I can play a testing sound using speaker-test:

$ speaker-test -c2 -f440 -tsine -Dhdmi:CARD=PCH,DEV=0

gnome-settings shows me "HDMI/DisplayPort - Internal audio" as an option to use, but there is no sound.

However, the sound does not work using pipeware on Gnome. Follows some more information:

$aplay -L
null
    Discard all samples (playback) or generate zero samples (capture)
pipewire
    PipeWire Sound Server
default
    Default ALSA Output (currently PipeWire Media Server)
sysdefault:CARD=PCH
    HDA Intel PCH, ALC3234 Analog
    Default Audio Device
front:CARD=PCH,DEV=0
    HDA Intel PCH, ALC3234 Analog
    Front output / input
surround21:CARD=PCH,DEV=0
    HDA Intel PCH, ALC3234 Analog
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=PCH,DEV=0
    HDA Intel PCH, ALC3234 Analog
    4.0 Surround output to Front and Rear speakers
surround41:CARD=PCH,DEV=0
    HDA Intel PCH, ALC3234 Analog
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=PCH,DEV=0
    HDA Intel PCH, ALC3234 Analog
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=PCH,DEV=0
    HDA Intel PCH, ALC3234 Analog
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=PCH,DEV=0
    HDA Intel PCH, ALC3234 Analog
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
hdmi:CARD=PCH,DEV=0
    HDA Intel PCH, HDMI 0
    HDMI Audio Output
hdmi:CARD=PCH,DEV=1
    HDA Intel PCH, HDMI 1
    HDMI Audio Output
hdmi:CARD=PCH,DEV=2
    HDA Intel PCH, HDMI 2
    HDMI Audio Output

Any help is appreciated.

Answer 1

probably, you use a video card shared with your cpu. Try adding support like this.

1. Open terminal and type

   sudo nano /etc/modprobe.d/alsa-base.conf`
   

2. Add this at the end of the file:

   options snd-hda-intel model=auto
   

3. Active IOMMU in boot:

   sudo nano /etc/default/grub
   

4. Change GRUB_CMDLINE_LINUX="" to:

   GRUB_CMDLINE_LINUX="intel_iommu=on,igfx_off"
   

5. Save the file and update grup.

   sudo update-grub
   

6. Reboot