audio passthrough not working

• c

  clmetal

  11/10/24, 9:31 AM

  It was working, now I don't have the option to change my output device from computer speakers to the HDMI plugged into my device.

  It's not the computer; if I put the HDMI into a TV, it then gives me that option to change output.

  When I tried running kvmd-edidconf --set-audio=yes again, it now says AssertionError: Invalid EDID length: 257, should be 256 bytes

  So I tried running kvmd-edidconf --set-mfc-id=TSB --set-monitor-name=Toshiba-H2C thinking it could be a monitor EDID issue but again I get the Invalid EDID length. error again

  any advice?

   

   

   

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• a

  annanoris247

  11/29/24, 4:09 PM

  Since you're using kvmd-edidconf and encountering an EDID length issue, it suggests there's an issue with how your system is reading the monitor or HDMI device's EDID. Normally, an EDID block should be 256 bytes. The error with "Invalid EDID length: 257" indicates something unusual with the EDID data space waves

  Check if your HDMI cable is functioning properly: A faulty cable can cause EDID communication issues.

  Try using a different HDMI port or adapter: If you're using an adapter, switch to another one to see if that helps.

  Force EDID reading manually: If you're using a specific tool like kvmd-edidconf, try explicitly reading the EDID from the HDMI port first before modifying it. If this tool is returning incorrect EDID data, you might be able to reset or update it.

  For example, you can try:

  bash

  kvmd-edidconf --read-edid
  This should display the raw EDID data, and you can verify if it's corrupted.

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• k

  kathrynthayer33

  12/12/24, 12:52 AM

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• OK

  Otis Kelly

  2/24/25, 4:27 PM

  That EDID length error is definitely a red flag—it seems like the EDID data got corrupted or isn't being read correctly by PiKVM. A couple of things you can try:

  1. Manually Reset EDID – Try resetting the EDID config completely and reapplying it:

     bash

      

     kvmd-edidconf --reset kvmd-edidconf --set-audio=yes

     Then reboot and check if HDMI audio is back as an option.

  2. Check EDID File – If that doesn’t work, see if your EDID file is messed up. Run:

     bash

      

     ls -lh /etc/kvmd/edid.bin

     If it looks wrong (tiny file size, etc.), you might need to regenerate a valid one.

  3. Reflash Default EDID hill climb racing – Sometimes replacing the EDID file fixes these issues. You could try grabbing a fresh EDID dump from your TV (since you said it works when plugged into one) and applying that to PiKVM.

  4. Force HDMI Audio in Config – If the HDMI output is recognized but missing audio, try explicitly setting the HDMI audio profile in PiKVM’s config (/boot/config.txt or /etc/kvmd/override.yaml depending on your setup).

  Let me know if any of these work or if you get a different error! 

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