OK so should anyone encounter the same:
Changing from opengl to sdl2 did resolve that last issue.
A Pentium G3258 at 3.2 Ghz has some speed issues, but it works fine with 4.6 and up.
Skylake or newer Processors should do with less frequency.
@mitu Thanks! I think I isolated the issue though: The refresh rate. I'm not sure why, but with the Pi and the same 32" LG monitor -- smooth at 60hz. When I adjusted the monitor to 50hz and set libretro to match the 2048 sample deviance went down dramatically in all the impacted emus. But I also tweaked a bit too much to be certain that's entirely it -- but that's what it seems to be thus far.
If my fix is a red herring I'll give your advice a whirl too. Thanks for another triage tip!
But once i boot pegasus with this theme Switch OS it doesnt appear anything. Any suggestion?
I'm not familiar with Pegasus and its themes, but are you sure you've run the 'generate' gamelist step in Skyscraper, after it downloaded the artwork for your games/roms ?
The problem was that the pi4 has 2 "connected" outputs (given by xrandrs output), this means that the MODE_CUR array is increased by one (HDMI-1 HDMI-2), and MODE_CUR[5] becomes aspect ratio instead of being the refresh rate, my solution basically looks for /primary/ instead of /connected/... but no clue if that will mess things up for others.
in keyboard mode and followed the extended guide on this forum. In this mode ES wont recognise it as a gamepad so I cant configure it in the menu.
That is strange! Because, even if ES configure Input Menu is telling you it hasn't detected a gamepad, pressing a "keyboard" key should get you through the configuration of the controls for player 1 (same as with only a real keyboard connected)! Have you tried pressing a button (mapped as keyboard key), or does the message that no gamepad was found had mislead you to assume that a keyboard cannot be configured via the UI? Going through that should give you a valid retroarch.cfg (as said for player 1), to add player 2 controls you still have to edit the file.
@huhogany Hi. where do i even find that line /opt/retropie....etc, etc? I am so lost and confused. Do I look for it on pc or use the pi4 gui screen? i have no idea where to find this. Is it a command line?
UPDATE: I got it to work. What I did...
Updated post fixes in vman 512 image... reboot
options
system tools
audio settings
set audio output to headphones
Solved the Issue just had to set the resolution in runcommand to the same resolution that was set inside lzdoom and viola no more crashing back to emulation station and losing hdmi signal.
RetroPie updates have nothing to do with the audio - it's the OS updates (kernel/firmware) that can affect it. Of course, using an experimental/beta driver might not be the most stable configuration at this time, so you might encounter issues with it from kernel/firmware version to another.