@mitu yes, unfortunately

@mitu This help request can be closed out. I ended up uninstalling retropie and Ubuntu and put Batocera on my SSD. Batocera seems to be more user friendly in terms of initial installation and settings. From what I've read Retropie has more options/settings but my emulation needs are simple and Batocera serves me well.

@mitu - Thank you! I wasn't. I am now and the xrandr commands have worked.

@jjrambo Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first

@lucent88 said in Rpi 4 w/ official 7in touch screen no hdmi out:

is there a way to make it detect on plug and unplug or do i just need to reboot, every time?

With the config.txt approach, yes, a reboot is needed since the configuration is only applied on boot. Not sure if there is a way to enable it at runtime - maybe for the HDMI port.

@MargoProxy said in Retropie not booting after trying to change resolution:

“Error parsing XML file /home/pi.emulationstation/gamelists/gbc/gamelist.xml No document found“ not sure if it has to do with the problem before or not

That's usually a sign that the gamelist.xml file is corrupt or not in the correct format. You can try deleting/renaming that file and then re-start:

rm /home/pi.emulationstation/gamelists/gbc/gamelist.xml

@mitu Here's the text that came out after the commands:

AP///////wBMLe4NAA4AAQEbAQOAeUR4CiOtpFRNmSYPR0q974BxT4HAgQCBgJUAqcCzAAEBBHQA MPJwWoCwWIoAUB10AAAeAjqAGHE4LUBYLEUAUB10AAAeAAAA/QAYSw9RHgAKICAgICAgAAAA/ABT QU1TVU5HCiAgICAgAToCA0/wU18QHwQTBRQgISJdXmJjZAcWAxIsCQcHFQdQPQTAVwcAgwEAAOIA D+MFAwFuAwwAQAC4PCAAgAECAwTjBg0B5Q5gYWVm5QGLhJABAR2A0HIcFiAQLCWAUB10AACeZiFW qlEAHjBGjzMAUB10AAAeAAAAAAAAAAAAAAAArQ==

Additionally, after hours of messing with this, when I plugged it in today it was magically working. I had just rebuilt the box after an issue with SSD corruption. I'm still willing to pull data/test to help anyone else who has come across this issue. I also plan on rebooting a few times to see if this is a fluke.

@melbmatt50 i did - both links are instructions for “headless” (no screen) set ups. you just need to plug your sd card into the pc you used to the write the image and create files in the /boot/ partition.

@vulture2600

try

framebuffer_priority=7

in config.txt

(works for me, I had to move from hdmi 0 as my fat micro hdmi adapter was pressing against the usb-c power connector)

@mitu Thanks, that appears to have worked! Now the fun of getting SM64 to run smoothly.

Thanks!

@radji Ran into this while I was researching my own struggles outputting dual monitors from my Pi 4. I found a way to get it done - I'll spare you the walkthrough if that's okay but it involved booting the desktop environment first with xrandr installed and the displays configured there - then rigging the thing to autostart emulation station from there on top of that environment. Long story short, I took a huge performance hit, even the gen. 4 consoles started dropping frames and chopping audio. I was super proud to get it working after many failures and posts online saying it couldn't be done, but unfortunately it just wasn't worth it in the end. Most people suggest an HDMI splitter and now that I can see how rough it can be on the system to make this work - just don't do it is my advice. Maybe it's a moot point for you by now, but FYI for anyone else down the road. Go with the splitter.

@quicksilver

I had an issue almost the same as this. I have a pi4b with a 7” touchscreen. When I plug it in to my tv it starts fine color burst and command line show fine on my tv and the 7” screen together, but as soon as emulation station starts the picture goes away and only the sound comes through the TV. If I go into command line or pixel desktop the picture comes back on the tv. After a couple weeks of frustration I figured out if I take the power off the touchscreen everything will work perfect on my tv.

@ifailflash It was probably customised in a way that was not safe to update. Impossible to know as we didn't make it.

@chuckyp most adapters have a headphone jack on them for audio which is far better quality than the jack on the pi.

@malixx Good to hear you figured it out!