[4.1.0 Unstable] Using 7TFT no HDMI image on TV (but I got sound)

[Defiant]

UPDATE 2:

I used display_default_lcd=0 on the config.txt
HDMI works fine on TV, no image on LCD screen. When rebooted without the HDMI cable plugged, still no image on LCD

[Substring]

@defiant ok, i didn't think about those LCD options in the config.txt. I've been working on my side for some autoconfiguration stuff. I'm not really sure of the rule, but this is how i think it goes :

1. look for HDMI
2. if no HDMI, go composite

Period.

Now, how I solved that (to use a geekworm DPI screen which is very handy) :

1. default forces lcd
2. if my monitor (and for now, only my monitor) is found, disable lcd and turn on HDMI

This is all explained in the doc of raspverry : https://www.raspberrypi.org/documentation/configuration/config-txt/video.md + https://www.raspberrypi.org/documentation/configuration/config-txt/conditional.md

[Defiant]

Alright!
Thanks for the info @Substring , I'll be doing some reading on these articles and as soon as I figure out a way to make this work with my config.txt I'll be posting the results here for future reference.

[Substring]

@defiant don't forget that recalbox sets 720p on emulators, so you should probably set config.videomode to default in recalbox.conf to avoid that. I have worked on a auto mode for the videomode, but it won't make it to 4.1 (despite it works just great)

[Defiant]

@substring I already thought of that, so I set config.videomode to default.
Now, I'm still having trouble getting it to work. I'm a bit lost at this point.
I can't get it to pick HDMI over LCD if HDMI is connected

[Defiant]

Well, I got it to work but only partially.
I added this to the config.txt:

[EDID=GSM-LG_TV]
ignore_lcd=1
hdmi_group=2
hdmi_mode=82
[all]

Now when the HDMI from my TV is connected before boot, it will detect and prefer HDMI and it works fine, and if HDMI is not plugged in, the LCD will come up as usual.

Problem is it only works with my TV... How do I make that work for example if I take it to a friends house?

[Substring]

@defiant I'm stuck at the same step ... It only works in very few cases (i.e. known TVs). I couldn't find any way to make it generic

[Defiant]

@substring I think the answer is finding a way to have it detect HDMI and if detected run ignore_lcd=1 and if not detected, don't run it or change it to ignore_lcd=0

[Substring]

@defiant indeed but there is no generic hdmi filter, unless we can put a * in the section name ... That's somethinh we should ask on the official pi forum

[Defiant]

@substring That's not entirely crazy! I'll test that and see how it goes when I come back from work.
In the meantime, can you give me a link to the official Pi forum? Thanks!

[Substring]

@defiant Yeah sure : https://www.raspberrypi.org/forums/

[Substring]

While searching, I wonder if these may be of interest :
https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=193430

[Defiant]

Ok I confirm [EDID=*] doesn't work.
I hope I just got the syntax wrong, or there's something similar.

[Substring]

@defiant You need to dig in the rasp forum ...

[Defiant]

@substring Well I tried and I don't seem to find a complete answer...
I found this article on PINN. I'm not using it, but can this be "adapted" to use on Recalbox???
link text

[Substring]

@defiant mmmhhhh after reading https://www.raspberrypi.org/forums/viewtopic.php?f=44&t=143286 it seems indeed much more complicated than expected as there is some configuration prepared depending on the screen plugged at boot (regarding the framebuffer definition, as I seem to understand) which makes it nearly impossible to swith it post boot.

I remember that switching to HDMI once booted on the DPI failed. Maybe i should give a try to vcgen commands to first disable the DPI and then switch to HDMI, who knows ... The only solution for now seems indeed to use PINN (which seems to be possible). I sadly don't have much time for now to tinker with this

[Substring]

The only solution I found is https://www.raspberrypi.org/forums/viewtopic.php?f=108&t=150889 which is the same as your post on the PINN readme

[Defiant]

Alright, I was just thinking the same.
The PINN answer looks like a solid solution.
I will try it during the weekend and let you know how it went.
Thanks!

[Substring]

@defiant great ! I thought about asking the PINN author what it would take to add Recalbox support ... If your tests are successful, you may just make me do the final step to get in touch with him

[Defiant]

@substring I'm sad to report I couldn't get it to work
For some reason after doing everything described in the instructions, Recalbox won't even boot on a fresh install.