HDMI audio not detected

Matt

6/21/23, 4:31 PM

I'm on Ubuntu 20.04.3 LTS, on a thinkpad T480. I just bought a new TV, and would like to use it to play audio/video from my computer, over HDMI. Video works fine, but I can't seem to get audio working. I know it's not a problem with the TV or the cable, because my nintendo switch works fine. I don't think it's a problem with my computer's sound card, because I've played sound over HDMI in the past (with a monitor, not a TV). When I do aplay -l the HDMI output is not even detected; I get

**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC257 Analog [ALC257 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

Any ideas? what commands should I run to gather more information?

EDIT: here is the output of sudo lshw -c video:

  *-display                 
       description: VGA compatible controller
       product: UHD Graphics 620
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 07
       width: 64 bits
       clock: 33MHz
       capabilities: pciexpress msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:160 memory:e7000000-e7ffffff memory:c0000000-cfffffff ioport:e000(size=64) memory:c0000-dffff

0 + 0

sound

hdmi

David

6/21/23, 4:57 PM

Where on the computer is the HDMI cable attached? To a video card or a sound card? If to a video card do you know that the video card also supports sound?

Pilot6

6/21/23, 5:19 PM

@David It is a laptop. There is only one HDMI port. It looks like a bug that HDMI output is not detected.

ubfan1

6/21/23, 5:32 PM

What video hardware are you using, and what driver? The proprietary Nvidia driver definitely should do HDMI sound, but not sure the nouveau driver will do sound

Matt

6/21/23, 6:09 PM

Yes, there's only one HDMI port, which definitely is capable of outputting audio (it did so on an old monitor)

Matt

6/21/23, 6:10 PM

I don't know how to check my video hardware or driver, can you tell me which commands will give me this information? It's a thinkpad T480 laptop.

ubfan1

6/21/23, 8:51 PM

Use lshw -c video to list all the video cards that have not been turned off from the BIOS/firmware. The "Configuration" line for each piece of hardware should list the driver.

Matt

6/21/23, 9:11 PM

Thanks! I added it to the question

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: HDMI audio not detected

TH: ตรวจไม่พบเสียง HDMI

RO: Audio HDMI nu a fost detectat

RU: Звук HDMI не обнаружен

VI: Âm thanh HDMI không được phát hiện

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