to chekck I made myself a Recalbox (latest version) ...with
disable_overscan = 1
hdmi_group=2
HDMI_mode =16 (later I used 42)
HDMI_force_hotplug = 1

...and it works with my Samsung 230b... now I have to find out what is different in newest retropie version.

@JDMDingo said in Force HDMI over Raspberry Pi Official LCD Screen:

@sli4 let me know if you got it running. Did you make the files (initDisplay.sh, config_hdmi.txt and config_lcd.txt, hdmi.name) in windows? Is so you need to convert them by using:

sudo apt-get install dos2unix sudo dos2unix /home/pi/initDisplay/initDisplay.sh

I also converted the config files, however that was probably not necessary.

Also the original post is not really clear about the configs. You copy all the text from config.txt and paste it into config_hdmi and config_lcd. Inside config_hdmi.txt scroll down untill you see “#hdmi_drive=2” and remove “#” then scroll to the bottom and add “ignore_lcd=1”. In config_lcd.txt scroll to the bottom and add “lcd_rotate=2”.

This is the clearest part of the thread. Thank you. I was getting very confused at the start.

@Zigurana Thanks for the note. I have pages that are quite similar!
I have done the index and the reordering. It works for the most part. However, notice how your volume command /usr/bin/amixer sset PCM,0 2dB- references PCM? That will fail on my USB because it is looking for HEADPHONES as a controller name. Sure, I can simply adjust my volume commands, but it is the embedded calls to PCM that would generate errors and for some emulators, I would get no audio. Perhaps I need to find another USB Sound card. The problem is that "amixer controller name" is not usually in the documentation!

Thanks @Howitzer99, I'll have to give that a try. Hopefully I'll have some time over the weekend.

@dankcushions That's a good call.

Supplementary would be my preference then, but @herb_fargus 's comment might actually settle it, then.

UPDATE: Kodi does the same thing at first, but after about a minute or so, it just starts working for no reason

@perhansa post your /boot/config.txt (put it in a codeblock)

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 (as agreed when registering)

@BuZz thanks. I'll try them all. Hopefully one of them will fix the problem.

@chudley78
Hello, you can check this post if you want. It's a little script which check if you have to use HDMI or LCD screen at boot.
https://retropie.org.uk/forum/topic/5527/raspberry-pi-official-lcd-screen-or-hdmi-option

@Floob @NinjaX567 after one of the new updates i no longer get audio in dreamcast either. Its only in dreamcast. I havent tried composite audio to see if it works on it.

@masteryoer
I had the same issue. The games under nes was slow and the audio was laggy.
The solution was not the resolution setting.
The solution was to change the audio driver under the raspiarch config and disable audio synchronization

@obsidianspider hey man, got the emulationstation station running great in the screen, only thing now is everytime I go into a game the screen just goes blank. Guessing that its a resolution setting issue :) but so pleased. Thanks! Will post pics when I can

@Charononus Glad I could help.

@Clyde said in Hdmi switcher help?:

My HDMI splitter also causes problems. It causes my Pi to choose a wrong video mode on the first cold boot of a day.

With hdmi_ignore_edid=0xa5000080, the problem is gone! 😄 Thanks again.

@LiqwdE ah ok. I don't actually know - I didn't read it in detail. If it requires software probably not.

Thanks the 7" is a ribbon cable, leaving my HDMI port free on the Pi.. .. Having a Bluetooth issue as well will start a new thread.

@t-prime
So, while I haven't begun with setting up my project, i still want to ask to be sure, as I'm quite new to all of this... (°_°). To keep the "fully working" hdmi, I can still follow the tutorial by adafruit (https://learn.adafruit.com/running-opengl-based-games-and-emulators-on-adafruit-pitft-displays/pitft-setup) and use their script, but I'll have to answer NO once I'm asked as you described and change the .txt file, right?

Thanks guys this has fixed my problem that night i asked. Got home from work and changed what you said and now everythings golden. thanks again.