RPI 3B keeps going to blank screen (cursor showing)

karsten13

I asked because I had problems with some modules which needed to much memory which results also in a black screen with white cursor.

You could try to run without the 3 foreign modules to see if the problem persists.

BigTJ

@karsten13

I have another MM running on a Pi 4B that uses all the same modules without a problem.

But I will give your suggestion a try. Thanks for the tip

Big TJ

BigTJ

@sdetweil Hi,
Were the displayed messages of any help in narrowing down the issue?

BigTj

sdetweil

@BigTJ said in RPI 3B keeps going to blank screen (cursor showing):

4067:0824/230903.755884:ERROR:broker_posix.cc(46)] Received unexpected number of handles

this is the error

we don’t really know the cause.
u can try disabling the use of gpu

change package.json line to look like this

		"start": "DISPLAY=\"${DISPLAY:=:0}\" ./node_modules/.bin/electron --disable-gpu js/electron.js",

BigTJ

@sdetweil Thanks for the suggestion.

I’ll give it a go and let you know if it is successful.

BigTJ

BigTJ

@sdetweil Hi, I have changed the line as your suggestion.
The mirror screen is still going blank after a short random period of time.

I have installed the ‘example’ mirror as per your suggestion to a previous query. The mirror works OK and (appears) not to go to black screen. Currently I am commenting out each module in config.js to try to identify if it is a particular module that is causing the problem.

My original set up uses the Calendar module twice (for 2 different users). Is this a possible cause of the problem? ie do I need to have independent modules one per user?

The following lines occur each time I start the mirror. Could this be relevant to my problem?

“[24055:0824/184036.476041:ERROR:viz_main_impl.cc(161)] Exiting GPU process due to errors during initialization
[24096:0824/184036.932766:ERROR:sandbox_linux.cc(376)] InitializeSandbox() called with multiple threads in process gpu-process.”

Thanks

sdetweil

@BigTJ if u did --disable-gpu, then u shouldnt be getting those messages

u can use all the default modules multiple times

when the screen goes black, does the mouse work? does it wake up?

BigTJ

@sdetweil Thanks for the response

I amended the package.json as follows;-

“start”: “DISPLAY=”${DISPLAY:=:0}" ./node_modules/.bin/electron --disable-gpu js/electron.js",
“start:dev”: “DISPLAY=”${DISPLAY:=:0}" ./node_modules/.bin/electron --disable-gpu js/electron.js",

Is this correct?

Yes the mouse still works. Cursor is a black arrow with a white outline. No it does wake up.
Control M works
Control R Works
Control Q works

The start up report of the mirror with minimal content shows;-

magicmirror@2.18.0 start
DISPLAY=“${DISPLAY:=:0}” ./node_modules/.bin/electron --disable-gpu js/electron.js “run”

[11.10.2022 11:45.29.988] [LOG] Starting MagicMirror: v2.18.0
[11.10.2022 11:45.30.003] [LOG] Loading config …
[11.10.2022 11:45.30.030] [LOG] Loading module helpers …
[11.10.2022 11:45.31.926] [LOG] Initializing new module helper …
[11.10.2022 11:45.31.930] [LOG] Module helper loaded: MMM-Wallpaper
[11.10.2022 11:45.31.935] [LOG] No helper found for module: weather.
[11.10.2022 11:45.31.936] [LOG] All module helpers loaded.
[11.10.2022 11:45.32.214] [LOG] Starting server on port 8080 …
[11.10.2022 11:45.32.258] [LOG] Server started …
[11.10.2022 11:45.32.261] [LOG] Connecting socket for: MMM-Wallpaper
[11.10.2022 11:45.32.268] [LOG] Starting node helper for: MMM-Wallpaper
[11.10.2022 11:45.32.270] [LOG] Sockets connected & modules started …
[11.10.2022 11:45.32.942] [LOG] Launching application.
[6000:1011/114533.695740:ERROR:sandbox_linux.cc(376)] InitializeSandbox() called with multiple threads in process gpu-process.

Any further ideas?

Thanks for your continued assistance

BigTJ

@sdetweil
Hi,
Did you have any further thoughts on this problem?

sdetweil

@BigTJ no. not really. 2.18 is fairly old and we have upgraded electron in each of the last releases

I would use my upgrade script, see
https://github.com/sdetweil/MagicMirror_scripts

it will complain about package.json as we made the disable-gpu change

so restore it first, before running the upgrade

cd ~/MagicMirror 
git checkout package.json

there is a new way to disable gpu use without editing that package.json file

edit the ~/MagicMirror/installers/mm.sh

and add

export ELECTRON_DISABLE_GPU

before the npm start line