No sound in Intellivision

dudleydes

@hurricanefan Glad to hear you got sound working.

I looked into this a little more and found that any audio sample rate below 44100 will work. I could've added -a44099 to the jzIntv launch command and sound would work.

These sample rates are not standard so here is a cleaner solution. As @edmaul69 suggested, I added the following line to /boot/config.txtand rebooted:

hdmi_force_edid_audio=1

I now have -a44100 in the jzIntv launch command and sound works fine. I tried -a48000 but that didn't work.

Let me know if this works for you and I'll add the info to the wiki.

What monitor are you using? It would be interesting to see if this issue is specific to certain manufacturer(s) or if it relates to all built in speakers on monitors. I am using an AOC I2757FM.

HurricaneFan

@dudleydes That hdmi_force_edid_audio=1 didn't do anything until I changed the jzIntv launch command.

My monitor is from the same manufacturer: AOC i2367Fh

edmaul69

@hurricanefan did you add the force edid audio and change it to -a44100 instead of what he previously had you set it in the emulator.cfg like he said? Does it work this new way for you?

HurricaneFan

@edmaul69 I haven't had a chance to tweak my pi with the other setting yet. I'll test it this afternoon.

HurricaneFan

@edmaul69 @dudleydes

Changing my setting to -a44100 made my sound stop working. I have both hdmi_drive=2 and hdmi_force_edid_audio=1 in my /boot/config.txt

Below is my command in emulators.cfg:
jzintv = "/opt/retropie/emulators/jzintv/bin/jzintv -a44100 -p /home/pi/RetroPie/BIOS -q %ROM%"

edmaul69

@hurricanefan ok

dudleydes

@hurricanefan Have you rebooted after making changes to /boot/config.txt?

HurricaneFan

@dudleydes Yup, I did it again and the sound still doesn't work.

Did you have the hdmi_drive=2 uncommented out in your config.txt?

dudleydes

@hurricanefan I have checked my /boot/config.txt file and have realised that I had the line hdmi_ignore_edid_audio=1 rather than hdmi_force_edid_audio=1. Apologies for the confusion.

According to eLinux RPi Configuration, adding hdmi_ignore_edid_audio=1 makes the Pi

pretend all audio formats are unsupported by display. This means ALSA will default to analogue.

This doesn't make sense. How can analogue sound be heard through HDMI?

I also tried using hdmi_ignore_edid=0xa5000080 as an alternative. This ignores the EDID data of the monitor "if your display is a crappy Chinese one". Sound works with this setting and the resolution doesn't seem to have been affected. I think this may be the better solution so if you could test this, then that would be appreciated.

hdmi_force_edid_audio=1 didn't work for me and hdmi_drive=2 had no effect either way.

I hope somebody with better knowledge of audio on the Pi can point to an optimal solution though I suspect the problem may be isolated to AOC monitors. I only came across this issue when testing. I output audio through the 3.5mm jack and use this cable to connect to powered speakers.

HurricaneFan

@dudleydes hdmi_ignore_edid=0xa5000080 works for me.

I've commented out hdmi_drive=2 and also hdmi_force_edid_audio=1 from my file.