VNC & HDMI are loosing connection after Pi is running for some time
December 27, 2023, 14:01
Hello I am using the PI-4. He is connected through a LAN cable. I am running a python scirpt on it and therefore want him to be always turned on.
When I turn the Pi on, while a HDMI cable is plugged in, he connects normally to my monitor. I go to the settings and turn VNC on and try to connect to the Pi through the RealVNC app. It works. I start the python script and let it run.
I change the signal from the monitor to my PC‘s display port (the HDMI is still plugged in) and use it. I turn the montior off and check back on the Pi at the next day.
I notice that I only get a grey screen as soon as I change the signal from the monitor back to HDMI. I try to connect to the Pi through VNC (what worked the day before) but it doesn‘t work. I just get the error: „The port on which the computer is listening for a connection could not be contacted.“. I can‘t turn the Pi properly of, so is unplug him from the power cable wait shortly and plug him in again.
The Pi boots and connects again to my monitor (the monitor is turned on while I do this). It works again. I go to the settings and look for VNC. It is turned off even though I didn‘t turned it off. Wheb I turn it back on and try to connect to the Pi, it works again.
This repeats every day. I do not know after which time it happens but it is often at the same day.
if you only want to run that python script why do you even have a monitor connected?
thats the reason why a headless operating system exists
Because I need to start the python script and I wanted to look if there will be issues on the script while it runs.
ssh
Is it possible to use ssh on mobile? Also I do need the graphical version for fixing issues in the script.
SSH on mobile = Yes
1. How? 2. Is it possible to get the terminal output from the python script in the ssh?
1. App store 2. Yes
I use termiux for this, it's nice and and easy UI is great
anyway back to the problem
is the pi fully shutting down or just display?
I think only the display. The red lamp is still glowing.
Thanks.
the red light?
what abt green?
Do you mean the green for the Ethernet cable?
nope
you have no green next to the red?
I do not see any green light there. Even at the time period after startup where everything works normal.
Do you have one there?
this means disk activity
aka if it's working or not
wait it doesn't even turn on when it is working properly?
Uhm yes…
I mean
Right now I can connect using VNC and the python script is also running (but it only does something every 2-3 hours), but I do only see the red light
just making sure your talking about these lights?
Yeah
There is only the red light
very weird
broken led?
I do not think so. I can’t remind a purpose on why it could be broken
even if it would be, I do not know how to check if it is broken or not
me neither
one second I'm thinking
Ok
ok next step is to determine if the pi actually turns off or not
we shall do this with ssh
Alright
ok get your pis ip first
Have it
oh yeah forgot you had vnc
:)
you know how to do ssh?
Well I do not really, I just downloaded „Termius“ (app) for SSH and there I entered some of the needed stuff. I got a connection to the Pi with this
great
connect now and run your python script
1. I do not know how to run the script with SSH. 2. I already started it earlier with VNC where it runned as it should
Did the pi shutdown when it did?
like is ssh still connected?
No not at when I started the script
Wait
I changed the device so I needed to login again. Yes it can connect.
ok so it is alive
but vnc and displays are a no go?
could you share your script please?
Not really, it includes session tokens and that stuff
VNC works right now, Display not
just delete them and put [token]
prob gonna do this but for what purpose?
so I can figure out what the problem is(?)
to help lol
I'm only tryna help you nothing else
wth is it?
I wonder why people do this
just use bots
Because I can not use a bot on all servers. in order to use them there, the owners have to add it to the server
If you understand what I mean
sneaky but okay, who am I to judge
anyway go ahead with sharing it's fine
alright, might take a bit of Tim until I got it
Oki dokie
Do you know if it is possible to get the script as output on the ssh thing?
I don't know ssh well enough
one second let me Google
vim filename.py
Ok thanks.
Hmm
oh idk then
use vnc instead
once you reboot ofc
I think I got it but it may be formatted weird
I will send it in dms
Did
after seeing the code... I have no clue why this would effect the UI at all