@substring Thank you, i will try that on the weekend. That troubleshooting is so time consuming.
@jidem I did exactly that as written twice. But it just works for Debian. If i boot Recalbox it stays at the LCD Screen. Don't know why.
and thanks guys!
@substring said in Switching image from LCD to HDMI when connected:
@nijate there is someone else having the very same problem as you and whom i answered yesterday.
If you.re using NOOBS, edit the /boot/config.txt to disable "display_force_hdmi", something like that.
The next problem is regarding N64 which runs at 640x480 in the default settings as well as dreamcast. They will look bad on the 7" i'm afraid if they even run ...
Well I tried all of these things. As I mentioned display_default_lcd=0 was the clue for Debian but could not be used for Recalbox or Libreelec. Hm.
I have to say I'm kind of happy with the N64 output. I put n64.videomode=default in the recalbox.conf and now everything displays fine. The only problem is: The image is on the left side of the screen and not in the middle. Well depends. On a few games (and seemingly different cores used) it is in the middle. I really don't get a clue why, haha. But it doesn't bother me, because the resolution is 4:3 nontheless and as soon as one plays you don't notice the screen anymore. But graphics and speed is superb!
Thanks anyways. I hope there will be a solution soon, it would be too nice. 
@voljega Thank you. Well, I just have to wait till someone with true knowledge of scripts and coding has the same problem as me and just writes a script, hehe.
Hello everyone!
I just registered because I am losing my mind over a problem here and for hours I can't find a solution.
My approach:
I am using a Raspberry Pi3 with Recalbox (and Debian jessie and also LibreElec) and finally bought the official Raspberry 7" Display. Everything finally works fine with it but:
I would like to change the picture to my TV when a HDMI cable is connected and I am booting. I finally managed to do this on Debian with display_default_lcd=0. But it just uses this command for Debian and not Recalbox or LibreElec.
Is there a solution to use this config also for Recalbox? I tried typing it in the recalbox.conf but this was no solution, it is still booting on the LCD Screen. There must be but I think I'm just too stupid or now to tired to find it.
As you can guess I am an extrem newbie in Linux and all concerning it. You would help me all lot, thanks in advance. And thank you for all the amazing work you are doing here.