Update: I tried these instructions: https://raspberrypi.stackexchange.com/questions/53408/automatically-connect-trusted-bluetooth-speaker/76288#76288

Installed BaReinhard's repo and rebooted. I was able to connect to the AirPods when it launched back up and for a brief moment sound actually came through from youtube on the AirPods and I thought I may have fixed it, but then it cut out again after about two seconds. I'm getting the feeling that it connects and then gets disconnected almost immediately for some reason. Indeed, looking at bluetoothctl it seems to connect then disconnect to the devices immediately.

E.g. it will say:

sudo bluetoothctl
Agent registered
[CHG] Device D0:03:4B:ED:E5:20 Connected: yes
[CHG] Device D0:03:4B:ED:E5:20 Connected: no
[CHG] Device D0:03:4B:ED:E5:20 Connected: yes
[CHG] Device D0:03:4B:ED:E5:20 Connected: no

in quick succession, continuing on with this "yes/no" pattern. It does not seem able to maintain a connection.

Don't know if that sheds any light on the problem.

@common763 when you power off the Pi... Are you just killing the power, or using a safe shut-down script.

Or even a Mausberry?

@mitu No, I am outputting at 1080p. Which was a pain. Whenever I try to change the resolution in raspi-config it just backs me out, so I had to set the resolution via terminal /boot/config.txt.

@challenger2010 said in No sound at all in Mortal Kombat 2/3/Ultimate:

I remember long ago that with Midway games in Mame, you had to go into the service menu of the game and turn the volume up.

This is right as the default volume is quit low on these machines.
But in the end you should hear something (very quit...but no silence at all), and the author mentoined that he allready used the volume control in the service menu ("F2").

Just to mention it: AdvanceMame has this great feature "auto level volume" which prevents me from running to the volume control on my setup as i dont have a remote control for my 2.1 logitech-soundsystem :)

Sorry for posting in an old thread, but I'm having this issue myself. Exactly as described in the OP. Only happens with Bonk's Adventure, both the US and Japanese versions. I'll try OP's fix, but I wonder if this is something that could/should be looked into?

hdmi_safe=1 is equivalent to:

hdmi_force_hotplug=1 hdmi_ignore_edid=0xa5000080 config_hdmi_boost=4 hdmi_group=2 hdmi_mode=4 disable_overscan=0 overscan_left=24 overscan_right=24 overscan_top=24 overscan_bottom=24

You can add

hdmi_force_hotplug=1 hdmi_ignore_edid=0xa5000080 config_hdmi_boost=4 hdmi_group=2 hdmi_mode=4 disable_overscan=1

instead of hdmi_safe=1.

@t3stin I don't know, I use a stock config and this is not set on my system. If you just want to test the sound, there's a command line speaker-test command you can use. Or download an .mp3 and play it from the command line with cvlc.

Update on what I've tried.

For the video, I've tried two different solutions, neither of which worked:

Modify the /opt/retropie/configs/all/retroarch.cgf file, specifically uncommented the line video_monitor_index = 1. I've had the value set to 0, 1, and 2. Each time, reboot and start emulationstation. It caused the system to slow to a crawl and forced me to reboot via ssh. Video still only displayed on the touchscreen Followed directions on this post to create a script for emulationstation: https://retropie.org.uk/forum/topic/7517/retropie-ubuntu-dual-screen/4
Script had the same effect as modifying retroarch.cfg. Emulationstation would load then the system would slow considerably.

For the sound: I've tried modifying the sound settings in emulationstation to each of the options (digital, analog, pcm, etc.) and tried running a game. Sound is still choppy. Also tried a test mp3 file with vlc player in desktop. Test file plays back correctly.

For the controller: I've tried re-configuring/remapping my controller and unplugging my keyboard while emulationstation is running. When I launch a game, the display does show my controller is connected at port 0. So not sure why it won't pick up the direction pads or analog sticks.

@152adam Just tried it in bin/cue format and the soundtrack is working now. So it seems likely the .chd format is the source of the issue with the cd audio. Wonder if anyone else has noticed this problem.

What settings do you have in the Sound section in Emulationstation ?

Thanks all for your help. I found a good image for the Pi0 and dont have any problems now :)

Image: Super RetroPie

@ahndrooan You can edit the topic title - there's no 'solved' checkbox :).

@quicksilver hey pal. Thanks for the advice! That did the trick. :) Cheers!

@mitu Thank you. I sorted it. I changed the TV itself to "external speaker" only and the Pi to hdmi. It seems to work fine now. I get no audio at all when I choose "3.5" or "auto".

Oh sorry misunderstood. Well, it's a little bit all over the place. Before overclocking, one TV I tried had 720p. It had occasional audio cut outs. Another TV had external speakers and had a resolution of 1920x1080. That one had terrible audio drop outs that lasted the longest. The last one I tried was at 3,840x2,160 and was working better than the other two. The audio dropouts were there but they didn't last as long.

Since that 720p TV still had audio drop outs, I don't think that could be the solution. But I haven't tried changing the resolution for any of the TVs so I'm not 100% sure.

I have this problem each time and have to remember to set it both in retropie and using the raspbian tools. Oh, and remember to turn up the volume on my amplifier :)