No sound with HDMI and Raspberry Pi 4

[Antjac]

Hi,

I'm trying to user Retropie with a Raspberry pi 4 / 4Gb and an old HD Ready (720p) TV.
But, I've no sound with HDMI...

I tried to follow some topics and I've added in /boot/config.txt but it gives a black screen after reboot
hdmi_drive=2
hdmi_force_hotplug=1
hdmi_force_edid_audio=1

When I've the blackscreen, here is dmesg :

4.036371] vc4-drm soc:gpu: HDMI-A-1: EDID is invalid:
[    4.036391] 	[00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    4.036414] 	[00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    4.036423] 	[00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    4.036433] 	[00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    4.036443] 	[00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    4.036452] 	[00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    4.036462] 	[00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[    4.036471] 	[00] ZERO 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

What can I do ?

[mitu]

Your TV has an empty EDID, which doesn't report which video resolutions are supported by it. Try adding in your config.txt:

hdmi_drive=1
hdmi_ignore_edid=0xa5000080
hdmi_group=1
hdmi_mode=7

[Antjac]

Try than starting from the lower end. Remove previous lines and add only

hdmi_safe=1

See if you get video/sound.

[Antjac]

Still black screen with just hdmi_safe (and all the hdmi_* added lines removed)

[mitu]

@Antjac what HDMI cable are you using ? Is it the ones that's sold with the Pi4 or another cable model ?

[Antjac]

The HDMI cable sold with the box :
https://www.amazon.fr/gp/product/B07WN3CHGH/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

[BuZz]

@Antjac which HDMI port? Use the one closest to power in.

[Antjac]

@BuZz It's better, I've no blackscreen anymore but still no sound...

[mitu]

Try adding to your config

hdmi_drive=2

and make use the Audio menu in RetroPie to select HDMI as the sound output.

[Antjac]

It's ok now, thank you :-)