[PROBLEM] Added screen now no sound over hdmi

[Tim Curtis]

I added the official pi 7" screen today and now have no sound.
If I disconnect power to the screen sound returns.
If I just turn off the local UI display setting I have no sound.
I am using hdmi to an avr
Is it not possible to output audio over hdmi with a screen attached?
Pi 3b+

Hi. I came across this very issue with my raspberry pi 4 and the official 7 inch DSI display and the fix for it (after going to hell and back) was to edit the boot/config.txt file and add the following:

max_framebuffers=2
framebuffer_priority=0
hdmi_channel_map=335201480


for users with rpi4, only hdmi-0 will work. 

hdmi_channel_map=335201480 maps the channels to the (at least for me) typical FL,FR,C,LFE... and not FL,FR,SL,SR....

I'm using camilladps for bass management and convolution. Works beautifully.

Hopefully this helps you.

Interesting.

Do you have links that explain what these settings do?

Code:

max_framebuffers=2
framebuffer_priority=0
hdmi_channel_map=335201480