No Sound over HDMI about chromium_os-raspberry_pi

[yunshansimon]

For some reasons, the sound driver of Rpi3 isn't compatible with CRAS. The default output mode is "auto" which can't output to either HDMI or headphone. So, we wrote a configuration file to force to output channel to the headphone jack. To change it to HDMI, you need to edit the file at /etc/init/force_audio_output_to_headphones.conf. There also contains a message to how to switch between two channels.

[nledenyi]

Can you please point me to a guide which describes how to access a shell within Chromium OS to edit that file? I simply just downloaded the image to an sd card and booted it with RPi3+, didn't build it from source. Is it not possible in that case?

[yunshansimon]

1. login
2. Ctrl-Alt-T open a shell tab
3. type shell to run bash
4. Modify the file

$ sudo mount -o remount,rw /
$ sudo vi /etc/init/force_audio_output_to_headphones.conf

[nledenyi]

Thanks, worked like a charm. As someone starting from scratch, I found this, together with other two issues (issues/9 and issues/10) really useful to get started - would be nice to persist these somewhere for others before they disappear from the issues.

[MartGrat]

Hello I have the same Issue with my Pipo x8 (z3637f intel atom) I got no sound hdmi. I tried to find the file you mentioned to edit it but I could’nt find it in the iso file

[bderen]

Hi, whatever I set 2 or 0 the sound always headphones. No HDMI audio. Any idea?

[adsports]

1. login
2. Ctrl-Alt-T open a shell tab
3. type shell to run bash
4. Modify the file

$ sudo mount -o remount,rw /
$ sudo vi /etc/init/force_audio_output_to_headphones.conf

hello
I try to enter with sudo but it tells me, ¨we trust have ..... ¨ and asks for my password.

How can I give write permission?

[rimonmath]

1. login
2. Ctrl-Alt-T open a shell tab
3. type shell to run bash
4. Modify the file

$ sudo mount -o remount,rw /
$ sudo vi /etc/init/force_audio_output_to_headphones.conf

I am using Raspberry Pi 4 B and latest version of this fydeos, There is no file named force_audio_output_to_headphones.conf in /etc/init

What to do now?