Getting the HDMI speakers to work on Bookworm

A project log for Portable Pi

An easy to build rugged-ish, portable-ish raspberry pi with a 10.1 ins screen and a 40% mechanical keyboard.

jefmerjefmer 02/07/2024 at 17:510 Comments

I mentioned previously that I had not managed to read a valid EDID block from the WIMAXIT monitor - in fact I thought it did not have one. However, running Bookworm, I managed to read it using the raspberry pi documentation guidance:

edid-decode /sys/class/drm/card1-HDMI-A-1/edid

From that, I saw that the EDID had an Audio Data Block describing the HDMI audio capabilities. This is of course missing from the EDID I generated.

So, I edited this new edid with AW EDID Editor v3.0.20 which is available free from ANALOGWAY to put in the 1024x600 timing information which seems to be incorrect in the version of the EDID from the display. This edited EDID when installed, as I outlined in the previous log, does let the display run with the correct resolution. (The editor is only available for Windows or Mac)

In an case, I have replaced the EDID file I previously uploaded with this new one.