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

[Substring]

@defiant hi

You're not the first one having troubles with a DSI screen. Such feeling that it gets drtected befire HDMI, therefore this screen is set as first. Have you tried tvserice -e "CEA 16 HDMI" ? You may have yo stoo ES first

[Defiant]

@substring said in [4.1.0 Unstable] Using 7TFT no HDMI image on TV (but I got sound):

tvserice -e "CEA 16 HDMI"

I haven't, but I will right now.
I just didn't know I had to use ""s and always got an error message, thanks for the tip.

So... I just did.
Turned off then on with CEA 16 HDMI
Just got sound, no image. The TV detects it as 16:9 1080/60p so it gets the signal right, only there's no image.

[Defiant]

UPDATE:

Just to confirm the HDMI is working, I added "ignore_lcd=1" to config.txt
Then I rebooted and as expected, I got image and sound from the TV, the RPi LCD is off now.

[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