[SOLVED] No HDMI sound and volume keeps resetting to 0

[helloThere]

@bdpyle

Had a similar issue with trying to get my sound to output to the 3.5mm jack.

https://retropie.org.uk/docs/Sound-Issues/#using-the-built-in-hdmi-audio

Maybe this needs to be uncommented: hdmi_force_edid_audio=1

[mitu]

@bdpyle said in No HDMI sound and volume keeps resetting to 0:

When I go into alsamixer I am presented with 3 sound cards:

bcm2835 Headphones
vc4-hdmi-0
vc4-hdmi-1

You seem to have configured the vc4-kms-v3d overlay in config.txt, instead of the default fkms overlay. Any reason you've done that ?

[bdpyle]

@mitu I'm honestly not sure what that is. I didn't add that to my config.txt. I will say that I have a 64-bit version of Retropie that can run Wii and Gameube games natively, so the OS may have been adited to add that in.

[mitu]

@bdpyle said in No HDMI sound and volume keeps resetting to 0:

I will say that I have a 64-bit version of Retropie that can run Wii and Gameube games natively, so the OS may have been adited to add that in.

RetroPie support for 64bit is still not part of any official release. Any 3rd party images are not supported here, as stated in https://retropie.org.uk/forum/topic/3/read-this-first.

[bdpyle]

@mitu Here are the lines in my config.txt file:

# Enable DRM VC4 V3D drive
dtoverlay=vc4-kms-v3d
max_framebuffers=2
arm_64bit=1

[bdpyle]

@hellothere Just tried uncommenting that, but still no luck.

I am getting the following errors in alsamixer:

VolumeControl::init() - failed to find mixer elements
alsactl: get_control:256: Cannot read control '3,0,0,Playback Channel Map,0': Invalid argument

[bdpyle]

@mitu So are you thinking that the reason it isn't working is because I am using a 64-bit version of RetroPie?

[mitu]

No, the audio errors are from enabling the kms GPU driver, which also adds the new HDMI audio driver.
Other than that, who knows what other configurations have been added to the image by its author - one of the reasons we don't support 3rd party images.

[bdpyle]

@mitu Thanks for the help. Just flashed a stock image of retropie onto a new SD card and audio works perfectly through the screen. Going to try removing

dtoverlay=vc4-kms-v3d

and see if that works

[bdpyle]

I successfully replaced the line

dtoverlay=vc4-kms-v3d

in my config.txt file with

dtoverlay=vc4-fkms-v3d

and now everything works perfectly! Thanks for the help @mitu