Elecrow 7'' touchscreen: No audio output on RPI5

Elecrow · February 19

Question:

The 7-inch IPS Touch Screen Display Monitor Module does not have the audio recognized on the Raspberry Pi 5. Works fine on the RPI4. Would you have any solution?

Answer:

The reason for this issue may be that the screen's EDID data was not correctly read in Raspberry Pi 5.

Method 1: Change a HDMI cable

Method 2:

You can use Pi4 to read the EDID, write it to a file. Then use it on Pi5 by adding the required command into kernel command line.

On a working boot capture the edid. e.g.

$ sudo find /sys/ -name edid
/sys/devices/platform/axi/axi:gpu/drm/card1/card1-HDMI-A-1/edid
/sys/devices/platform/axi/axi:gpu/drm/card1/card1-Writeback-1/edid
/sys/devices/platform/axi/axi:gpu/drm/card1/card1-HDMI-A-2/edid
/sys/devices/platform/axi/axi:gpu/drm/card1/card1-Writeback-2/edid
$ sudo cp /sys/devices/platform/axi/axi:gpu/drm/card1/card1-HDMI-A-1/edid /lib/firmware/myedid.dat

then add to cmdline.txt (for Bookworm, the file is at /boot/firmware/cmdline.txt)

drm.edid_firmware=myedid.dat

Other method:

disabling VNC Server